There is no end to goodness. There is not a finite amount of success. There is more than enough to go around. — Joel Comm, Internet marketer
Because there’s not a finite amount of success, you can root for other book authors while still promoting your book. You and your fellow authors can all succeed. Indeed, you will succeed better if you support each other.
Support every book author who comes your way for support! Write about them. Social share their posts. Do a video for them. Interview them for your podcast. Support their bestseller campaigns. Support their crowdfunding campaigns. And, of course, you should expect them to do the same for you.