I wish I had some useful advice, but my knowledge of instances is fairly limited. I haven’t experienced any downtime over at lemmy.ca, but I really only use that one when lemmy.world is down, or when I’m trying to test federation issues. I also have an account at fanaticus.social, but that’s mostly for sports-related content. Not sure this community would fit in over there. I do have to say, the niche instances seem to be nice. But spreading the word might be a little tougher.