You’ve got the topic you really want to write about but not sure if its relevant or if there is even interest in what excites you.
Go to the book store, see what other books have been written on it. Are any seeing the unique part you see?
Now got to the newspaper and magazine stand. What’s there that you can gather input from.
Be sure you cover all bases where your topic is being talked about and take notes, buy the publication and subscribe to the emails.