Switch to Fedora I would say. Debian is up to date currently, as things are settling down to be LTS, but over the years it will get fewer updates. Fedora is even more up to date than Ubuntu, but more stable than Opensuse Tumbleweed, which would be the Opensuse equivalent.
If you want a perfect experience with KDE, I dont know what to recommend but there are bugs that will probably simply not be fixed in Debian for the next 2 years, as they are postponed to Plasma 6, mainly the glitches when fractional scaling.
Gnome is really stable I think, Fedora should give the best experience here.
Btw using Distrobox you can run ANY Linux app easily. On Fedora Kinoite (ostree, like Silverblue) I run the VLC 4.0 beta currently, which is only available as an Ubuntu PPA. no problem at all. Do mainly for AUR or Ubuntu PPA apps Distrobox is brilliant.
Fedora itself also has COPR where lots of community packages are.
If you want recent deb-based, there also is KDE Neon user edition. Used that for a while, but I switched to immutable Fedora and never going back.