You don’t wanna use rolling release distros trust me, the whole point of server is automation and less maintenance. I got couple personal servers running, after things i need got setup and all of them running at a decent capacity, i just turn them on and never worry about them. Old package and software doesn’t necessarily mean less security, quite opposite actually, i suggest you take a look at how stable distros distribute their software, such as Debian. For a Debian package becomes stable, it has to go through several stages, experimental, unstable, testing, and finally stable, that’s why their packages are old, and because they are old, they are secure. It might be quite opposite than what you expect.
Mostly i use Debian for my personal servers, some of them are stable and some of them are testing, because of Podman’s new feature Quadlet. Honestly many features of Debian feel really old, like APT’s source list, preferences, and the way to deal with unattended upgrades. It’s kinda hard to get it at first and it’s easy to shoot yourself in the foot, especially many people tend to unintentionally mix and match packages from different suites for new software. But once you get comfortable with it things just work.
As my experience, no matter what distros i use, the worst distros are always those that i don’t understand and in a hurry to put them into production. Just pick one popular server distro and learn the ecosystem, you will find out what distros you like really soon.
It's just that i wanna learn more about computers. At the time with Windows I didn't think i could really understand what is going on behind the scene. It hides too much stuff from the users and there was a weird idea in my head that the advanced use of computers is supposed to be in the command line, Windows just doesn't seem to be the right choice. I don't play much games or even heavily use computers in general, so my laptop basically became a big toy for me to tinker with.