It’s a bit of a cliché comment on HN but does mastodon/bluesky/etc have to be as big as twitter? There doesn’t have to be one conquering platform/protocol to rule all.
> Bluesky: “If you liked Twitter, you’ll love Bluesky.”
> Mastodon: “If you hated Twitter, you’ll like Mastodon.”
That actually sounds like a good niche for each of them.