Invisibly; by trying to post in it and encourage others to do so. There is not much management to do with such a small community. The majority of regular users watch the All feed, so subscriptions are really just a way to bookmark the community to post in it or find it more easily. For smaller or new communities, expect it to be more like your personal blog as it is unlikely to be something others will post in regularly. The majority of communities that are hourly-active were made prior to the rexodus of June 2023, or within a few weeks thereafter.

Unless you're in a very controversial space, actively micromanaging a community is likely an issue with the mod not the community IMO. The admins take care of the majority of wack-a-mole nonsense here.