The scenario to move from Cloudlinux with Plesk to CentOS is not officially supported yet.
You can perform this action at your own risk using the steps provided by Cloudlinux: Installation
Then, you will need to manually install some packages such as 'psa-mod_fcgid' and remove 'passenger-cagefs' if applicable.
However, the most preferable way is to migrate to a new server with CentOS.