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use a modern, popular distro. There are less things broken and you get more support
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do a fresh install with a fresh user to nor carry over your broken configs and customizations. Do everything from scratch again
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Tackle the issues one by one and provide detailed steps to reproduce, error messages, logs, screenshots or videos. You can ask right here on lemmy, but you'll probably get more eyes on it on reddit tbh.
I felt just like you a long time ago when kde introduced wayland at the end of 2016. After a couple of super frustrating months, I made a backup of my /home, migrated my archlinux to btrfs (by doing a fresh install) so I can have snapshots and revert if I mess something.
Had only minor issues since then and most have been fixed some years later. Others I've learned how to work around (for example by using gamescope, because I have mixed resolution multi monitor setup and some games think my 2k screen is 4k)