I might try Friendica, although coming from lemmy I’d be more inclined towards Mbin, to combine topic-focus and people-focus.
However as a developer I first check the code repos and see that both are based on php, which seems rather old, and i doubt this would scale efficiently if the network really took off. Recall that twitter was once based on ruby (like mastodon is) and shifted to scala for such reasons. So I feel, these are exploring well the potential user-experience, but the code may need a fresh structure (if somebody knows this tech issue better, please say). It’s good to discuss these things, to help consolidate potential efforts.