The surefire way to develop your own voice on your instrument.
It seems to me like this is one area that musicians obsess over. "How do I find my voice on the instrument?"
I've read the following two pieces of advice and they seem to make perfect sense in an almost Zen kind of way.
I read an interview with Stanley Clarke where when he was asked that question he said, "Learn to play your instrument and don't worry about it."
Makes perfect sense to me. Once we learn our instrument to the point where we don't have to think about technique and what we are playing our "Voice" will come out.
The other thing is embrace your quirks. I've heard Victor Wooten say it, I've heard Steve Vai say it, I've heard Jimmy Herring say it. I've found it to be true. When I look at all of my favorite players in any genre on any instrument I've noticed that they all have their quirks that they readily accept as a part of who they are and how they play.
If I were to expand on these 2 things I'd say keep learning and growing. Let's look at Marcus Miller for a moment. Marcus has a very identifiable sound and approach. But I've also noticed that rather then just fall back on his standard vocabulary that he is adapting techniques like Palm Muting a`la Anthony Jackson, double thumping a`la Victor Wooten, and thumb and index finger plucking a`la Dominique Di Piazza and incorporating them into his style too.
I honestly think if you follow these three concepts you will be well on your way to developing your own voice on your instrument.