I am not sure if I understand your issue. The whole point of federation is that you don't need to care about the instance, just about the people you want to follow.
Discovery is a little harder, of course. But if you already have some prior form of contact with the people you'd like to follow, then you can just get their handle and go directly to their page.
Discovery is a little harder, of course. But if you already have some prior form of contact with the people you'd like to follow, then you can just get their handle and go directly to their page.