I don't think it is possible to give tips for finding one's voice; it's one of those things for which there aren't really any tricks or shortcuts, or even any advice that necessarily translates from writer to writer. All I can tell you is to write as much as possible.
If you find yourself imitating another writer, that doesn't have to be a bad thing, especially if you are a young or a new writer. However, you should be conscious of exactly how you are imitating him - word choice, sentence structure, motifs? - and think about why you're doing it.
Young writers shouldn't be afraid of striving to emulate their favorites. It's a good way to learn, as long as you move on from it and don't publish too many of the results.
If you're a freelance writer and aren't used to being ignored, neglected, and generally given short shrift, you must not have been in the business very long.
I certainly wanted to write a book that was honest about New Orleans without explaining it to death, so much so that the first draft contained references absolutely incomprehensible to anyone who hasn't lived here for several years.
I'd much rather do an obviously commercial writing project than get a day job.
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