mariadb takes too much load though having sufficient RAM

I am facing more CPU usage for my app server. Server configuration is as below. 1> CPU: Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz 8 core 2> RAM: 32 GB 3> 600 GB SSD NVRAM 4> Mariadb version 10.3.17. 5> OS: Debian 9 I have run mysql tuning script to optimize server performance and add some parameter in my.cnf. But yet it's not creating big impact. I can see that RAM used very less compare to CPU. How can I balance in both and improve server performance? Here is my tuner script output tunner . Here is current my.cnf output on my.cnf