Gave up for now. I miss the refactorcamp mastodon, and I have a backup of it and a server subscription that I'm not using. My life got a lot more complicated so I haven't had time and energy to start it on the new server.
If you know of someone with the technical skill and time and energy to get it up and running again, I could give access to the server and the backup. The day-to-day maintenance wasn't too bad, I might be able to do that.