Completely optimise Webserver (Apache & MariaDB on WHM/Cpanel/CentOS)

We are running our own web server. We used to run Litespeed but now we want to switch back to Apache The server is already partly optimised. But after the switch back to Apache we need someone to completely optimize the whole web server (Apache, MariaDB, WHM, Cpanel, etc, etc) to make sure the webserver is taking good use of the resources available. This includes for example selecting the right php handler, for the resources, and so on. Also, you need to check if the security is right. We only want a highly skilled person, as this is a one time job, and it should be done right. Also you need to provide us with a list of changes you made.