I think you’re over-categorizing. See this advice:
4) Creating too many categories
Over specialising categories is a common problem that manifests itself differently in communities old and new. It most commonly manifests as a gigantic front page, filled with every possible permutation of the community’s general topic. A community about games might have separate categories for firstperson shooters, thirdperson shooters, side scrollers etc, where they would better be served with either a category marked “Shooters” or simply an overarching category marked “Games”.
In new communities, this stems from a desire from the founder to make sure that any topic the community could want to talk about is covered. While this is understandable, it will lead to users simply being intimidated by the enormous number of categories at their disposal. In most communities with vast numbers of categories, the majority of them will lie fallow. If a new user posts in one and doesn’t get a response, they’re unlikely to persist much further.