Did you forget to add a picture or two?

If they are within three feet or so of being the same, you might consider adding a tall, perhaps even floor to ceiling, corner cabinet in the corner with the longer side to take up the wall space difference and then decorate the equal sides that are left. choose the kind of corner cabinet that has a straight side on each side so you create a "side wall" between the corner cabinet and the rest of the wall.

Think five sided w/front side much wider than the other four.

https://foter.com/explore/corner-tv-stand-cabinet