frankly this is why there's a strong culture of encouraging folk to post a tagged introduction post when joining many many fediverse servers, to both, well, introduce someone to their neighborhood but also to create opportunity for folk to recommend connections they see between the new person and their own network of connections.
no software was implemented to support this; it's people powered, like the best bits of the networks you've most enjoyed over the years.
see also hashtags, follow fridays, fediblock, mosstodon, etc etc etc.
lean into people-power.