If we really want to get away from reddit, we could follow the standard convention when it comes to user designations. A person who uses
Facebook is called a Facebook user. A person who uses Twitter is called a Twitter user. A person who uses Android is an Android user. Reddit is somewhat unique among the most popular websites as people identify other users like they're in a fandom rather than people who have an account on a particular website. I'm not sure if other fedditors want to even think about themselves as part of a fediverse fandom. I do think redditor was a fortuitous term for reddit to happen upon because it flows from standard convention (it sounds a lot better than reddinite, reddinese, reddan). If you start from wanting to designate a user of the Fediverse or ActivityPub protocol, I think Fedinite or Feditor are two obvious choices. I went with Fedditor with the double consonant as an homage, but I think if migration was coming from a website where everyone was just called "Forum Users", Feditor would still be a top suggestion.