What Do You Like to Read?
Here’s an obvious approach to narrowing down the subjects to write about. What do you like to read? What type of nonfiction books have you bought and read in the past? Do you recognize a pattern? It is best to write about subjects that you like to read about. If you haven’t read about it by now, chances are you might not be interested in writing about it. Is there a void that can be filled with a book by you?
Take a look at your personal library. Make a note of the dominant subject areas that you seem to read about the most. What is missing? Is there a subject you could focus on under that broad subject area? Do some research on that market and see what you come up with. Out of all of your books you own or have read at the library, make a list of your top 10 favorite books.
Is there a subject you could expand on, or could you modify a known success? What is your all time favorite book? This is a great way to narrow down the list of subjects. When you narrow down the list of subject areas, you can better focus on a specific subject to write about.