Nginx Varnish Apache php-fpm 403 Forbidden

The truth is, not being able to use Varnish is a problem for me. I've been using it + PHP-FPM for years with CWP in CentOS 7, and the performance is much better in WordPress.
I'll investigate to see if I can adapt it to work.

First look to opcache + Redis to speed up WP sites:
https://blog.alphagnu.com/speedup-wordpress-decrease-server-load-redis-cache-cwp-centos-webpanel/

Then look at WP Rocket or WP Super Cache:
https://wp-rocket.me/wp-super-cache-vs-wp-rocket/

And then there's the Cloudflare CDN caching layer potential:
https://www.cloudflare.com/learning/cdn/what-is-caching/