I'll be honest, not being able to get a handle on mastodon.social put me off adopting Mastodon for quite a while (until I found the invite system). While I'm glad there are other instances, that doesn't really help you if the one instance you do want to be on is full. This is my third Mastodon account, but the one I'll stick with
@stroughtonsmith I had the same thoughts, instead I signed up over at mas.to.
After realising that sign-ups were available again, and that instances could be aliased, I retired the former, linked, and migrated to .social