When I’m writing a book, I don’t worry about potential sales, potential audiences, or potential marketing scenarios. My first concern is always this: Do I love the book project? Will I like being involved in writing the book for months or even years? That’s how I decide if a book is worthy of my commitment.
Source: https://bookmarketingbestsellers.com/self-publishing-qa-how-do-i-pick-a-topic-to-write-about
When you discover what truly excites you, what truly moves you and gives your life purpose, you can accomplish anything you want and do it with amazing creativity, energy, and enthusiasm. — Barry Heermann