Lemmy is not very big right now, and for lots of topics, there just aren’t enough users to sustain an active community. Making new communities is NOT a good way to stimulate such activity, as a general observation. Communities are successful if they start from a base of users that already exists, and their topic was already visible in existing communities. Like maybe a lot of news-related threads turn out to be about politics, so the politics community splits off. (I don’t know if that particular one happened that way, but it is a standard pattern).