Copying teaches technique; eventually you must teach technique your own accent.

Imitation is how technique transfers, and there is no shame in it. But copying can only take you as far as the person you copied, because what you absorbed is their solution to their problem. Your accent appears when you use the borrowed technique on a problem that is genuinely yours.

Keep imitating deliberately, but afterward ask what you would have done differently and why. Then do that version. The accent is not something you invent, it is what remains after you stop correcting yourself toward someone else.