OP, you're still in the black metal beginner stages. There's no harm in that, of course. Bands like Emperor, Immortal, and Burzum are still cool as hell even if it is somewhat more predictable. The black metal rabbit hole goes very deep. It is some of the most interesting and unique music you can find when you start getting into more obscure stuff. In "mainstream" black metal it's still a lot of fun because it's different from other genres, but as you get deeper into it you'll find black metal music really isn't afraid to push boundaries of musical convention itself and you get some cool and novel listening experiences that just don't sound like anything else. Another great thing about black metal is that it mixes really well with other genres, whether it's folk, synthwave, shoegaze, post rock, or classical music.
Here are some of my favorites from 2021-2022. I'm a black metal die hard and have been following it and listening to everything for about 15 years now.
Honestly I find it terrible as gym music. It's something I like to focus more of my attention on and if I want intense "get me amped" music I'd prefer death metal or hardcore. But black metal will always be my favorite genre to listen to when it comes to giving my full attention to music and getting lost and immersed in it.