Sounding like your heroes is a phase, not a failure. Your own sound shows up once you stop fighting the phase.

Every voice starts as a collection of borrowed ones. You imitate what moved you because it is the only vocabulary you have, and while you are inside that stretch it feels like a problem to fix. It is not, it is how the learning works. Over time the borrowings come from more places and start interfering with each other, and the specific way they interfere is yours.

Steal openly from more heroes rather than fewer. Learn precisely what each one does that you like, in technical terms if you can. Then let them sit together in the same piece and see what you get.