What place does your intuition — your deep, inner knowing — have in your writing process?
It is such an available help to you. It can help you know what stories to include or not include. It can help you hear what your book wants to become. It can serve as a guide for where your book wants to go after you've written and edited it.
How do you "know" things in normal life? That same kind of knowing is welcome here in your book-birthing process. Trust your intuition.