Anne Marie Pace advised:
"Set goals that you have control over—you can’t set a goal to win an award or to reach a certain level of sales. You can have a goal to write the best books you can."
And I would add that, like Seth Godin related, an additional writer's goal should be to be an altruistic writer:
"[...] marketing and idea spreading, working every day to deliver your message with authority [via writing]."
Thus, go forth and write good books that spread beneficial ideas.