When you're editing your book, there will no doubt be whole sections that don't make the final cut. It's okay. I encourage you to save those scraps.
Who knows how those pieces might help you launch your book eventually? Perhaps they can be repurposed as blog posts or articles or insights shared on social media that help extend the message of your book when it's time to do so.
Those scraps become invaluable during that time. They give you stories and insights to share that are unique and interesting, even if they weren't the right fit for the final version of your book. They demonstrate your heart and authority to speak on your chosen subject matter.
Those scraps don't have to stay on the cutting room floor, in other words. They can play a purpose still, if you save them.