@KT to clarify for you folks, I'm one admin out of a few on SBC, and we, the Sunbeam City Co-operative, may be able to lend a hand in the time after your current admin leaves to help you set up as a co-operative in your own right. This mostly just requires people to be on board with the idea. Come chat to me or others on SBC if you're interested.
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.