The cPanel software does not support in-place operating system upgrades, to upgrade your OS to a new release or a supported operating system, we recommend acquiring a new server with a fresh supported operating system installation upon which cPanel & WHM may be installed. We can even install cPanel & WHM on your new server at your request.
Currently supported operating systems are CentOS 7, CentOS 8, CloudLinux 7, CloudLinux 8, or AlmaLinux.
Once you have a server with a supported operating system and cPanel & WHM, you may perform a cPanel to cPanel transfer using the Transfer Tool! The cPanel-to-cPanel transfer process using the Transfer Tool is seamless, and you can find more details on the Transfer Tool here: Transfer Tool.