Go to the plugins directory. Disable and remove any now-superfluous plugins for caching, security, SSL, image compression, etc…pretty much anything to do with security or performance.
Make sure plugin Gridpane Redis Object Cache is activated, and go into settings and change it so it’s running against Redis, not FastCGI. Also make sure plugin Nginx Helper is activated, and go into settings and enable the cache purge button.
Delete the Hello, Dolly plugin. If the site will not be accepting comments, delete the Akismet plugin.
Install and activate the Simple History plugin.