Are you living like a writer? If you want to be a writer, and get good book ideas you should start living more like a writer. Writers read more than non writers. They talk and listen more. Are you living like a writer?
Try developing habits of a writer to increase the quantity and quality of your ideas. When you are in a slump and don’t feel like writing, then pick up something to read. Read books and magazines in your area of specialization regularly while keeping your eyes open for ideas.