fix my wordpress website

I am looking for a Linux / Wordpress guru to fix a client web site that keeps getting hacked. Also, I want to update the core, plugins etc to the latest and make any coding changes necessary to get the site up and working properly. I do not want to take a chance on beginners. You must be an expert.
My last guy set me up on Centos 8 / CPanel. Now we are on an unsupported hosting version.