That really is the dream, where your mini-community can link up and be part of the mega-community. Mega-communities linking together so you aren't missing out on friends being on other sites you don't use. An actual web of social networks and communities accessible from your own.
Maybe the losses incurred by enshittification won't be as devastating if a community can just choose to uproot to their own instance without losing years, even decades, of historical content when the inevitable happens.
With Meta though, there's a deep and deserved mistrust to overcome before anyone remotely in the know will have anything to do with them. You could probably convince most sites to federate with anyone but Meta, Twitter, or Reddit if it happened tomorrow. TikTok is on thin ice, though.