Linux

Some computer repair places specialize in Mac and windows, but there are many who don't have those restrictions (and they're usually more competent). You'll just need to do some searching.

You're bound to have problems no matter what OS you run, but some are more complicated and higher maintenance than others. If you want to switch to Linux then I'd recommend Linux Mint or Ubuntu usually, but maybe something like Fedora Silverblue (or any other immutable distro) if you value stability and safety; particularly for workstations. Those sorts of distros do 'atomic updates' and let you roll back easily if anything fucks up, opposed to a traditional Linux experience where you can get screwed by a partial or corrupted update.

However, while Windows is terrible, it may be better to stick with it if you just need something that works, particularly for work, or if you need to use software which might not work (or work properly) on Linux.

But if you're feeling bold, take the plunge and try something new. Just remember to keep backups of anything important and maybe keep a few installer USBs handy (maybe one for windows and one for your chosen Linux) just in case something goes wrong and you need a fresh start, or wanna run back to what you're used to.