I don't know if they're considered alternative rock, or even alternative pop anymore, but Blood on the Dancefloor is good music to listen to if you're working on like... a fight scene or... otherwise intense/dramatic scene.
if you're not a fan, i'm sorry, i just really like them and recommend them a lot
Otherwise, I listen to a lot of 21 Pilots and Halsey XD Which you already mentioned, but whatever. For wordless music, TheFatRat is a good provider for a variety of beats and jams-! And if you're into it, vocoloid always makes good background music that isn't too intrusive (as is most music in languages you don't understand... at least thats what I've noticed).
If you're looking specifically for punk, there's the classics like Fall Out Boy! There's also... Ghost Town! And Set It Off! Set It Off is really good!