Your creative voice becomes clearer after enough borrowed voices stop satisfying you.

Borrowed voices work until they stop fitting, and the dissatisfaction is the useful part. You begin to notice the places where the imitation says something slightly untrue for you, and those places are the seams where your own voice comes through. The clarity arrives through irritation more than inspiration.

Pay attention to the moments where your work feels false even though it is technically fine. Write down what you would have said instead. That alternative, repeated often enough, becomes the thing that sounds like you.