Whether you're writing your first book, or if you've just finished it, you should be thinking about improving your writing. According to the guys over at tiny gigantic, you shouldn't just think about it. In their piece, "10 Writing Tips To Make Your Mother Proud" they discuss ten straightforward practices to become better at writing.
The most interesting tip to me is about reading your own writing aloud. Does your writing sound like the way you talk? If not, re-write it so it does. Practicing this tip alone can also help you become a better speaker. Becoming a better speaker will bring more opportunities to talk. With a well written book and a great presentation in tow, the odds are in your favor for even bigger opportunities going forward.