Unfortunately we need to stay in bigger community groups until the level activity grows to a point where a community needs to break into smaller groups for specific games etc.

Alternatively you could make a c/StreetFighter and populate it while you wait for people to slowly come, I've been doing that with several lemmy communities, but I can only maintain so many postings per day. That being said, the rate which each of them have grown already is greater than I could have hoped.

You would also need to factor what instance to build it on, whether it is likely to get defederated and if its going to be one which people may check etc. However, if there is no other community yet, you just need to make sure its a simple enough domain to remember, etc. You really only need to post say twice per day.