What do I do if instance A (this is where the person I follow) decides to ban instance B (my instance of choice)? What if this happens more than once? Should I

What do I do if instance A (this is where the person I follow) decides to ban instance B (my instance of choice)? What if this happens more than once? Should I reregister every month and refollow the same people again and again? What if I set up my own server and people will decide that some of my toots are not "left" or "progressive" enough?