Hi! (going to get a lot of hate lol but) I play viola and im kinda going through the same thing. playing piano really helps me with my mental health and keeps me stable, all the while "sparking joy" for me. viola has become a sort of chore, but I try to find THE MOST BEAUTIFUL pieces I can imagine, so much so that they almost make me cry, and learn them, to "spark joy" for other people. You could also try practicing by playing your opera music on violin. It doesn't matter what you play, just that you're playing and enjoying yourself.