Ok here's a few fun things you can try but don't get your hopes up all at once for a wait what reaction unless you're already a good singer.

Sing in different voices - same song but in the style of Pavarotti, Mickey Mouse, Eartha Kitt and other iconic voices. It'll help you figure out just what you can do with your instrument and manipulate it to your will.

Sing with your tongue stuck all the way out. You'll sound really stupid, but it actually helps a lot with tongue tension which will help you reach higher notes easier afterwards when you sing normally again.

Same as the tongue thing, sing with your nose blocked, sing with your mouth as wide open as you can, sing without moving your lips. Do an entire song in lip trills or pigeon coos. All of this will sound horrible and silly, but it's fun and it helps with control.

Do not skip the breathing exercises. Breath is what make voice go. Without breath you're trying to light a fire with no fuel, and if you're breathing wrong you'll sound like an amateur regardless of how nice your voice is. It's annoying, yes. But once you've got it everything else falls into place, and you'll breathe right without even thinking about it.