Life is like an elevator. On your way up, sometimes, you need to stop and let some people off. Evaluate the people in your life. Then promote, demote, or terminate as needed. Be real. You are the CEO of your life.
You are also the CEO of your books. Create partnerships with other people, but be sure to evaluate them as you proceed. Make sure they really fit in to your marketing plans and into what you want out of your books and other products. Be real.