I think if you feel like you should focus on visual art first then that's probably what you should do. Switching between different disciplines works for me but everyone is different and it's even harder to be motivated when you don't really want to do something.
Problems like these are tricky because it's mostly psychological. But something I've been practicing is to not feel bad when I have days where I'm not very productive or creative. That was actually one of the ideas behind //TODO: today and one of the messages I want to bring across, that sometimes just doing a little is at least better than doing nothing even if it doesn't bear big results. And sometimes it's just important to rest and take time off (although it's difficult to feel like this is actually for the sake of productivity :'D)
Of course that doesn't change quality or improvement but I think even there it's helpful to try to accept that there are days where you are better or worse than usual.
I haven't completely solved this problem either so there's not really much else I can add, but I think ultimately everyone has to find an answer for themselves anyway (although taking a look at other people can still be a valid way to get there). I hope this wasn't completely off the mark for your situation!
And fair enough with the criticism :'D If you still feel like sharing it and don't want to post a wall of text you can contact me at firstname.lastname@example.org