Optimization Assistance Needed for cPanel Server: Seeking Advice for Improved Performance

I'm currently experiencing performance issues with my shared hosting server, resulting in slow operation due to insufficient optimization. The server configuration includes an 8-core CPU, 16GB RAM, 512GB NVMe storage and 50+ cP Account user in a VPS environment. I'm seeking guidance on the key areas that should be addressed for cPanel server optimization. Could you please share your expertise or suggest the aspects I should focus on to improve the server's performance? Any advice or best practices on how to optimize a cPanel server under these specifications would be greatly appreciated.