[spiantino]

If you click the three dots on a recommendation you can select "show less like this" and you won't see recommendations from that subreddit. Also, there is a setting in user settings to prevent recommendations from subs you don't subscribe to from appearing at all, but I would give the algorithm a chance since there are interesting subs you probably aren't aware of.

Also, I wouldn't call making recommendations in home feed a growth hack, fwiw.