Once the book is out there, you can use its own success as a fresh excuse to talk about it, which April Dunford calls a “momentum launch.” Did you hit #1 on Amazon with your pre-order? Grab a screenshot and tell your story. Earn your first dollar in royalties? That’s a story. Get your fifth perfect review? Tell people! This works especially well for books about business/money/marketing, but can also be creatively applied to many other topics.