I have 600% high CPU usage mysqld

I have an insane usage of cpu mysqld +600% here is the file my cnf # Example MySQL config file for medium systems. # # This is for a system with little memory (32M - 64M) where MySQL plays # an important part, or systems up to 128M where MySQL is used together with # other programs (such as a web server) # # You can copy this file to # /etc/my.cnf to set global options, # mysql-data-dir/my.cnf to set server-specific options (in this # installation this directory is /opt/lampp/var/mysql) or # ~/.my.cnf to set user-specific options. # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option. # The following options will be passed to all MySQL clients [client] #password = your_password port =3306 socket =/opt/lampp/var/mysql/mysql.sock # Here follows entries for some specific programs # The MySQL server default-character-set=utf8mb4 [mysqld] user=mysql port=3306 socket =/opt/lampp/var/mysql/mysql.sock key_buffer=64M max_allowed_packet=10M table_open_cache=64 sort_buffer_size=2M net_buffer_length=8K read_buffer_size=256K read_rnd_buffer_size=512K myisam_sort_buffer_size=8M query_cache_type=1 query_cache_limit=512K query_cache_size=0 query_cache_min_res_unit=256 innodb_thread_concurrency=0 innodb_log_file_size=128M # Custom changes max_connections = 400 query_cache_limit = 32M query_cache_size = 0 innodb_buffer_pool_size = 20G innodb_buffer_pool_instances = 10 innodb_log_file_size = 1G innodb_log_buffer_size = 5G innodb_file_per_table = 1 innodb_open_files = 400 innodb_io_capacity = 1000 innodb_io_capacity_max = 40000 innodb_flush_method = O_DIRECT innodb_read_io_threads = 8 innodb_write_io_threads = 4 thread_cache_size = 100 innodb_lru_scan_depth = 100 innodb_read_io_threads = 64 innodb_write_io_threads = 64 open_files_limit = 4096 table_open_cache = 2048 join_buffer_size = 128K read_buffer_size = 128K log_warnings = 2 key_cache_age_threshold = 64800 innodb_change_buffer_max_size = 10 max_write_lock_count = 16 # End custom changes # Where do all the plugins live plugin_dir=/opt/lampp/lib/mysql/plugin/ # Don't listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (via the "enable-named-pipe" option) will render mysqld useless! # #skip-networking # Replication Master Server (default) # binary logging is required for replication # log-bin deactivated by default since XAMPP 1.4.11 #log-bin=mysql-bin # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id =1 # Replication Slave (comment out master section to use this) # # To configure this host as a replication slave, you can choose between # two methods : # # 1) Use the CHANGE MASTER TO command (fully described in our manual) - # the syntax is: # # CHANGE MASTER TO MASTER_HOST=, MASTER_PORT=, # MASTER_USER=, MASTER_PASSWORD= ; # # where you replace , , by quoted strings and # by the master's port number (3306 by default). # # Example: # # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, # MASTER_USER='joe', MASTER_PASSWORD='secret'; # # OR # # 2) Set the variables below. However, in case you choose this method, then # start replication for the first time (even unsuccessfully, for example # if you mistyped the password in master-password and the slave fails to # connect), the slave will create a master.info file, and any later # change in this file to the variables' values below will be ignored and # overridden by the content of the master.info file, unless you shutdown # the slave server, delete master.info and restart the slaver server. # For that reason, you may want to leave the lines below untouched # (commented) and instead use CHANGE MASTER TO (see above) # # required unique id between 2 and 2^32 - 1 # (and different from the master) # defaults to 2 if master-host is set # but will not function as a slave if omitted #server-id = 2 # # The replication master for this slave - required #master-host = # # The username the slave will use for authentication when connecting # to the master - required #master-user = # # The password the slave will authenticate with when connecting to # the master - required #master-password = # # The port the master is listening on. # optional - defaults to 3306 #master-port = # # binary logging - not required for slaves, but recommended #log-bin=mysql-bin # Point the following paths to different dedicated disks #tmpdir = /tmp/ #log-update = /path-to-dedicated-directory/hostname # Uncomment the following if you are using BDB tables #bdb_cache_size = 4M #bdb_max_lock = 10000 # Comment the following if you are using InnoDB tables #skip-innodb innodb_data_home_dir=/opt/lampp/var/mysql/ innodb_data_file_path=ibdata1:10M:autoextend innodb_log_group_home_dir=/opt/lampp/var/mysql/ # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high #innodb_buffer_pool_size=512M # Deprecated in 5.6 #innodb_additional_mem_pool_size = 2M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size=5M #innodb_log_buffer_size=8M innodb_flush_log_at_trx_commit=1 innodb_lock_wait_timeout=50 character-set-server=utf8mb4 collation-server=utf8mb4_general_ci [mysqldump] max_allowed_packet=10M [mysql] # Remove the next comment character if you are not familiar with SQL #safe-updates [isamchk] key_buffer=20M sort_buffer_size=20M read_buffer=2M write_buffer=2M [myisamchk] key_buffer=20M sort_buffer_size=20M read_buffer=2M write_buffer=2M [mysqlhotcopy] !include /opt/lampp/mysql/my.cnf I don't know if this is the right code to use for better performance, I'm using wordpress. I'm experiencing some problems with my mysql server When I run top command, it sais that mysql process has taken over 350-600% of CPU I'm running ubuntu 18.04 with 32 GB RAM