I used to publish and have some anecdata you may find encouraging. In my experience, if you’re thoughtful enough to wonder if you have something interesting to say, you likely do.

Aside from that bit of data, there is one definite advantage to writing. The process of writing a book is a great way to learn more and get better at explaining what you know. This is a double edged sword because if you spend six months on a first draft, you will likely see a major difference in quality between the first section you wrote and the last.

You may make some money, but you’ll almost certainly learn something.