When you say that you’re having problems getting Joplin to work, are you saying the official AppImage isn’t working for you?
Oh! I managed to overlook that! Will try it out, thanks!
And also, since you’re on Fedora 31, have you checked this post out yet?
I've been using that Copr repo, not the AppImage (not that it should make a difference, but 
) . However, I am running 5.5.7-200.fc31.x86_64 and I didn't run into any lock-ups.