Definitely try to message the subreddit moderators to see if they wanna promote this in a semi-official way.
It’s quite hard to do that as a lot of communities aren’t willing to put in the time of setting up a community on the fediverse. We tried to get a lot of indie game subreddits on board but so far it’s just silksong and balatro. Unless a bigger group of people on reddit ask for it then not much can happen