Debian 10 (Php-FPM+Lighttpd) Optimization - High CPU - response not received, request sent: 1909 on socket: tcp:127.0.0.1:9000

I am looking for an experienced developer to optimize my Debian 10 Php-FPM Lighttpd setup. Currently, my server is experiencing high CPU usage and I am receiving the error message "response not received, request sent: 1909 on socket: tcp:[login to view URL]". I have attempted some optimization measures in the past, but they did not work. My server is a dedicated server, and my website is quite large with over 100 pages and over 500 daily visitors. Ideal skills and experience for this job include: - Strong knowledge of Debian 10, Php-FPM and Lighttpd - Expertise in server optimization - Experience with troubleshooting and fixing high CPU usage issues - Ability to work efficiently and effectively to minimize any downtime for my website.