I honestly think it will be better to keep pumping resources into kbin.social. You can spam us to keep donating to help keep it up, I think it's worth it. It's hard for people to understand that you can sign up at multiple different servers, Mastodon has even understood this and they're going to a more centralized by default approach.
Concentration is not a bad thing, we are still using an open protocol and can communicate with people who are using that same protocol. If we continue to divide it will make it harder for adoption, and less people will end up using these services.