Getting people to do new stuff is hard.
You have to make it cool (interesting), cool (hyped), or fun, or easy, or cheap, or ...
or as many of these as possible.
often it will be hard or lonely or boring or a little dumb in the beginning for the trailblazers - but that can change fast. IMO Mastodon is already interesting, cheap, & easy.
Twitter was boring & dumb in the beginning, imo. Now it's dangerous, with pockets of value (COVID, disability rights). How do we get those people over here?