If you are in the situation to reinstall, why don’t you try the testing builds that already start with KDE6, so the amount of packages to update will be much less?
I would start with Grauda Dr60nized (non-gaming). Then from there, when everything is installed, updated and working, there is a tool to add all the gaming stuff.
You’ll see in the thread that there are major issues still under investigation (after installation someone fails to boot), but I understand that the cases are limited to only some AMD systems.
If you don’t want to try the testing builds, or if you encounter the same issue there, you could work your way through this tutorial.
I know, it’s long and “demanding”, but also quite comprehensive.