It’s like an intersection of curation at different levels of analysis.

You curate the repertoire.

You pick the piece.

Then you listen to various implementations of that piece played.

Then you learn from the one you like the most as base.

Then you introduce and experiment with elements of other pieces you liked.

Then you experiment with your own ideas, from dynamics, to tempo, to anything else.

As you grow, you’ll develop styles that you like, a language of your own, and the pieces that you play will be more original and honest to your interpretation.

That is how you are creative as a musician.