Linux

Because others already suggested Arch/ EndeavourOS, I'll be suggesting something else: Bazzite.

It's part of the image based ("immutable") Fedora series and is basically Fedora Kinoite, with all drivers and codecs already set up for you, self managing, with many gaming tweaks included.

It's rock solid and basically unbreakable, while also being extremely modern and updated. On Arch, even if it doesn't break, you always get the newest stuff, which might not be as polished. On Fedora, it matures a few months, while still being very modern.

The main target group is "For Linux users who don't want to use Linux", meaning, it runs all your favourite stuff (KDE, etc.) without having to care for anything. It even updates itself automatically in the background without any interference.

If you prefer something with less "bloat" (a lot of optional tools and software to choose from, but nothing mandatory), then check out Aurora, which is basically the same, but without gaming stuff.

For more information, check out universal-blue.org

Just a small heads up for OP: You have to do quite a lot of (advanced) things differently from now on if you choose Atomic.

Use containers (Distrobox, etc.) for everything you can, avoid installing stuff on the host if possible, etc.

Just use Flatpaks for 95% you do graphically, and for CLI stuff or software that isn't available as Flatpak, I would recommend you to create an Arch Distrobox container (already set up IIRC) and use that. You can even install stuff from the AUR and export it, so it works just like it is supposed to.