I've moved to a new Mastodon server. Just to be clear, the https://yesterweb.org folks were great!
What happened was I discovered that if that server shut down, I'd lose all of my posts. You could export them but you can't move posts (toots?) to a new server and so I decided hosting my own Mastodon instance was in my own best interest for now.
My instance is not open to sign ups. It's just me.