If you're still running CentOS 6, you know for a fact that you need to get to another operating system pronto. The folks CloudLinux/AlmaLinux know this, and have made changes to their open-source lift-and-shift tool, ELevate, so that you can now easily move from CentOS 6 to land on the latest version of just about any RHEL look-alike that you want.
The Gentoo Linux distribution is in the process of shuttering its Gentoo Foundation now that it's become a Software in the Public Interest project, which gives it tax exempt status and much, much more.