I would say just start writing. You've got to write every day. Copy someone that you like if you think that perhaps could become your sound, too. I did that with Hemingway, and I thought I was writing just like Hemingway. Then all of a sudden it occurred to me - he didn't have a sense of humor. I don't know anything he's written that's funny.
That term's definitely got a negative aura to it, because people think a diva is somebody with an attitude who demands things all the time. Of course there is that type of diva, but my idea of a diva has always been a singer - whether male or female - who gets on that stage and captivates you with their presence and their voice.