Do people on the subreddit know about this community?
Has this community been advertised to people on the smashbros subreddit who may be looking to make the switch? Might be a good idea to make a post there with a link to this community and instructions on how to join.
This graphic is a good intro to how Lemmy works and how to think about it.
If anyone wants to go ahead and cross-post to the reddit sub, that might help attract more users here.
It's a website to show where subreddits splintered off to, and it's been a guide for newcomers. The r/smashbros mods didn't advocate leaving or recommend any alternatives, so it isn't a part of the list.