Hello mryash again (i think i replied to your other post already).
CloudLinux is a great tool for web hosts offering shared and reseller web hosting but it's definitely not all you need for a secure web server (autossl functionality won't increase your servers security at all).
I wish I could go into detail but you should at minimum consider CSF (https://configserver.com/cp/csf.html) - but don't stop at installing software you really need to make alot of changes and ongoing tweaks to maintain a "secure" web server.