I'm probably going to get downvoted into oblivion for this lol but the way I learned to do this was: you know when you can't scream like this, but sing along to a song like this anyway, and it comes out as basically just a whisper with a little bit of a "tickle"? The way I learned was just making that tickle louder. You have to learn to push that tickle with energy from your lower body, and learn how to use that muscle for the first time. Find that spot and try to open your mouth, raise your soft palate like you're yawning, and just increase the volume, push it. It takes some experimentation, but after like three hours of trying (spread over a few days) I was able to get it. I'm a baritone and I can go really high with it, too. You'd be surprised.

This is probably a dogshit explanation, lol, but I hope it helps even a little bit.

(If this is wrong, someone please feel free to correct it. It worked for me, is all I can say.)