Probably use a scraper to peel it off the drywall. You probably will damage the drywall (but not destroy it) and then need to patch and maybe paint (unless you can cover it with a larger mounting plate or some of those children’s glow in the dark stars or something ) later. Maybe mount a mirror - it will make the room look bigger!
“Maybe mount a mirror - it will make the room look bigger!”
It will also make anyone who sees it grin at you in a knowing way.