I have a number of Lemmy instances meant for discussion groups around specific topics. They are not being as used as I expected/hoped. I would like to set them up in a way that they can be owned by a consortium of different admins so that they are collectively owned. My only requirement: these instances should remain closed for registrations and used only to create communities.
I am not sure what “instance members” you are referring to, here.
The topic-based instances are closed for registration, so there are no users there.
If you are referring to the communick.news instance: it is only configured to have admins creating communities on it and the general instructions are to use https://fediverser.network as the place to discover communities.