I don't know who needs to hear this (no, really, I don't) but I'm building a new and completely from-scratch fedi microblogging server in C Sharp. I would very much like to have more help. It's early days, but the general thesis for the project is to have a better admin and moderator experience than mastodon. It's called #Letterbook.
If you wanted to help build the fediverse, but working with Ruby and/or the Mastodon core team wasn't appealing, this might be a better fit, and we should chat.