But people don’t care. Homelab subreddit created a forum and after 5 days, the number of registered users on that forum is 18. Selfhosted subreddit did the same thing and activity on their forum is similarly low. If people on “selfhosted” subreddit don’t want to move to a selfhosted alternative, I don’t know if there is any hope for other communities.

The selfhosted community on Lemmy (https://lemmy.world/c/selfhosted) is up to 12.5k subscribers and seems fairly active so it's possible there might be enough people who care this time for it to work.

These things tend to not work until all of a sudden they do.