You too, friend.
Can you not create communities on other instances? I hadn't tried or thought about it. I guess that's a downside of a really small or self hosted instance
Yep. But a community's mods need not be on the home instance, so you can moderate from anywhere.
You could, for example, create an account just for creating communites on a particular instance, but then give your other account a moderation role and moderate all from a central account.