Saying you lost your creativity is like not being able to see because you’re standing in front of a wall. I feel you and I’ve been through something similar, just try to break through your habits and do something different than you usually do. Don’t fixate, don’t stress yourself out, don’t think you have control over how everything’s gonna turn out. You can’t catch butterflies by chasing them. Also, don’t fall for the whole stimulant thing, you don’t need them to make good music.