What are some prominent new rock artists?

Would, to generalize, heavy metal be considered part of rock genre? If the answer is "yes", then oh boy, does it have quite a stream of new bands...

I don't think so, in my mind heavy metal is pretty distinct. I do agree that that's not dead.

Dirty Honey, The Black Tones, Greta Van Fleet.

It's easy to find more with modern music streaming services.

King Gizzard and the Lizard Wizard are both popular and novel.

Love these dudes

The 1975 are huge, and The Dare are getting huge.

And there’s a thriving middle class of rock artists: Alvvays, Future Islands, Fontaines DC, MJ Lenderman, Yves Tumor, Alex G all play large if not stadium-sized venues.

You can find classical orchestras everywhere too, but the earshare of classical music isn't much in the non-musician population (and even that is probably artificially propped up by forced exposure in schools).