This is the problem, making the fork known to the userbase of the original software. When the Atom text editor was killed by Microsoft we decided to fork it as Pulsar but it was an uphill struggle to really get the word out. We got a massive boost when the youtuber Distrotube featured us in an episode and again with an itsfoss article but we still routinely find people who have been using Atom without knowing we even exist.
Out of curiosity rather than necessity, are there any activitypub based messaging apps (i.e matrix/discord-like)?
One not listed is Ibis (https://ibis.wiki/) which hasn’t had much traction. Honestly unsure of how useful it is as a direct wikipedia replacement but i can see it as a cool idea for a bunch of related communities that would otherwise be on separate wikis.