Mine deeper, the books say about plot. Discover the meaning of your story, the theme. The perfect expression of your theme will come someday from one of your readers. You never say your theme outright in your book, but it’s there, behind everything. Your friends will say, “The book’s good.” Your relative, the one who really doesn’t like you, will say, “I didn’t get it.” But someday that perfect reader will say out loud your theme and it will fill you with joy.