back in the day I was in a shitty posthardcore band, but we made a point of specifying we were "saltcore metal." We put it on posters, mentioned it between songs, after a couple of small local tours, venues started promoting us as "local Salt lovers" or "the originators of saltcore." I believe it may have been mentioned in some local rags / blogs / internet radio stations

Really, unless you're either deliberately being derivative, or you genuinely believe in a genre/movement and you've deliberately employed any semiotics or patterns of that movement, the micro genre is irrelevant.

As I got older and got into art criticism, it was taught to me by a mentor that criticism is the art of communicating to someone what it was like to experience something they haven't (yet) experienced.

If you are trying to give your music a taxonomy for your own purposes, it only matters what your instinct tells you. If you're doing it for marketing purposes, it matters what will sell the most. If you were doing it for artistic purposes, I would expect you'd already know your genre.

Or maybe it just has elements of a genre, but not all art can be taxonomically classified.