Someone on Nostr led me to this, which I'm using now: https://rsslay.nostr.moe/. The problem is, I don't have control over this new Nostr profile that auto-posts all my Mastodon posts, and I can't migrate my existing follower base there. It will suffice for now (I just need to figure out how to auto-repost on my existing Nostr profile every post that this new profile makes). Did you have something else in mind? How would it be better?