One of the things you could do as a new Linux user is to try out some support questions with your favorite search engine. Try ‘catchyos my headset mic is not working’ or ‘nobara how do I change my background wallpaper every 15 minutes’ or ‘<distro name> <real problem you’ve had the past 2 years>’.

This approach will give you an realistic view how much support you will have when you’re dealing with an actual problem.

I’m running lotro via Lutris happily on Mint. Your case sounds like a permission problem somewhere as the launcher works.

This is farfetched I know but try a nuclear option and use another distro to install lotro via Lutris to a shared mount and then mount & run it from there in your distro.