Help Me For Implementing MySQL tuner suggesstions

Mine is Digitalocean with 1vCPU, 1GB -25GB SSD Ubuntu server with nginx, MariaDB, phpmyadmin and running a wordpress blog. Mysql is taking too much cpu and on running running MySqlTuner, I got these suggestions:

``
Variables to adjust:
  *** MySQL's maximum memory usage is dangerously high ***
  *** Add RAM before increasing MySQL buffer variables ***
    query_cache_size (=0)
    query_cache_type (=0)
    query_cache_size (> 16M)
    tmp_table_size (> 16M)
    max_heap_table_size (> 16M)
    performance_schema = ON enable PFS
    innodb_log_file_size should be (=16M) if possible, so InnoDB total log files size equals to 25% of buffer pool size.

`` the ouput of ulimit -a:

`
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 3788
max locked memory       (kbytes, -l) 65536
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 3788
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

` The full MySqlTuner report is as follows:

`
 >>  MySQLTuner 1.8.1 - Major Hayden 
 >>  Bug reports, feature requests, and downloads at http://mysqltuner.pl/ 
 >>  Run with '--help' for additional options and output filtering

[--] Skipped version check for MySQLTuner script
[OK] Logged in using credentials from Debian maintenance account.
[!!] failed to execute: SHOW REPLICA STATUS\G
[!!] FAIL Execute SQL / return code: 256
[OK] Currently running supported MySQL version 10.3.31-MariaDB-0ubuntu0.20.04.1
[OK] Operating on 64-bit architecture

-------- Log file Recommendations ------------------------------------------------------------------
[!!] Log file /var/log/mysql/error.log doesn't exist

-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in MyISAM tables: 267.8M (Tables: 54)
[--] Data in InnoDB tables: 416.0K (Tables: 20)
[OK] Total fragmented tables: 0

-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: OFF
[OK] No stat updates during querying INFORMATION_SCHEMA.

-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[!!] There is no basic password file list!

-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 1d 12h 39m 35s (5M q [39.556 qps], 41K conn, TX: 196G, RX: 657M)
[--] Reads / Writes: 96% / 4%
[--] Binary logging is disabled
[--] Physical Memory     : 981.3M
[--] Max MySQL memory    : 3.2G
[--] Other process memory: 0B
[--] Total buffers: 432.0M global + 18.9M per thread (151 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 564.4M (57.51% of installed RAM)
[!!] Maximum possible memory usage: 3.2G (335.01% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (8/5M)
[OK] Highest usage of available connections: 4% (7/151)
[OK] Aborted connections: 0.00%  (1/41165)
[!!] name resolution is active : a reverse name resolution is made for each new connection and can reduce performance
[!!] Query cache may be disabled by default due to mutex contention.
[OK] Query cache efficiency: 33.8% (2M cached / 7M selects)
[!!] Query cache prunes per day: 13820
[OK] Sorts requiring temporary tables: 1% (9K temp sorts / 532K sorts)
[OK] No joins without indexes
[!!] Temporary tables created on disk: 77% (65K on disk / 84K total)
[OK] Thread cache hit rate: 99% (7 created / 41K connections)
[OK] Table cache hit rate: 99% (2M hits / 2M requests)
[OK] table_definition_cache(400) is upper than number of tables(235)
[OK] Open file limit used: 0% (189/32K)
[OK] Table locks acquired immediately: 99% (2M immediate / 2M locks)

-------- Performance schema ------------------------------------------------------------------------
[--] Performance schema is disabled.
[--] Memory used by P_S: 0B
[--] Sys schema isn't installed.

-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is enabled.
[--] Thread Pool Size: 1 thread(s).
[--] Using default value is good enough for your version (10.3.31-MariaDB-0ubuntu0.20.04.1)

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 28.5% (38M used / 134M cache)
[OK] Key buffer size / total MyISAM indexes: 128.0M/46.4M
[OK] Read Key buffer hit rate: 100.0% (230M cached / 12K reads)
[OK] Write Key buffer hit rate: 99.5% (744K cached / 740K writes)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool / data size: 128.0M/416.0K
[!!] Ratio InnoDB log file size / InnoDB Buffer pool size (75 %): 48.0M * 2/128.0M should be equal to 25%
[OK] InnoDB buffer pool instances: 1
[--] Number of InnoDB Buffer Pool Chunk : 1 for 1 Buffer Pool Instance(s)
[OK] Innodb_buffer_pool_size aligned with Innodb_buffer_pool_chunk_size & Innodb_buffer_pool_instances
[!!] InnoDB Read buffer efficiency: 83.72% (1661 hits/ 1984 total)
[!!] InnoDB Write Log efficiency: 41.67% (5 hits/ 12 total)
[OK] InnoDB log waits: 0.00% (0 waits / 7 writes)

-------- Aria Metrics ------------------------------------------------------------------------------
[--] Aria Storage Engine is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/0B
[!!] Aria pagecache hit rate: 87.4% (515K cached / 65K reads)

-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.

-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.

-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.

-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] Binlog format: MIXED
[--] XA support enabled: ON
[--] Semi synchronous replication Master: OFF
[--] Semi synchronous replication Slave: OFF
[--] This is a standalone server

-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
    Reduce your overall MySQL memory footprint for system stability
    Dedicate this server to your database for highest performance.
    Configure your accounts with ip or subnets only, then update your configuration with skip-name-resolve=1
    When making adjustments, make tmp_table_size/max_heap_table_size equal
    Reduce your SELECT DISTINCT queries which have no LIMIT clause
    Performance schema should be activated for better diagnostics
    Consider installing Sys schema from https://github.com/mysql/mysql-sys  for MySQL
    Consider installing Sys schema from https://github.com/FromDual/mariadb-sys  for MariaDB
    Before changing innodb_log_file_size and/or innodb_log_files_in_group read this: https://bit.ly/2TcGgtU 
Variables to adjust:
  *** MySQL's maximum memory usage is dangerously high ***
  *** Add RAM before increasing MySQL buffer variables ***
    query_cache_size (=0)
    query_cache_type (=0)
    query_cache_size (> 16M)
    tmp_table_size (> 16M)
    max_heap_table_size (> 16M)
    performance_schema = ON enable PFS
    innodb_log_file_size should be (=16M) if possible, so InnoDB total log files size equals to 25% of buffer pool size.

` htop What do I need to adjust in order to increase the performance of my MySQL instance and reduce cpu usgae?