Looking for, say, Fiber Art as a catch all, then more specific like Embroidery, Knitting, Spinning, etc.
Painting as a catch all, then specific mediums like Watercolor, Acrylic, etc.
(If this topic ends up old and hasn’t been posted in in a while, feel free to still comment. You have OP’s permission, don’t feel bad!!)
@jules So, to clarify, you’re not specifically looking for THOSE topics you listed, but similar catch-all topics? I think that’s a good idea, but I’d suggest starting that catch-all topic yourself with magazine/community and then have tags be the sub-topics. You’d have more people want to join the community if it more or less covered the more niche topics within, and thereby getting more activity to follow.