Nonfiction writing is this unique animal...
With fiction writing, you can practice every day, create more stories, and improve your craft.
But nonfiction writing is different... because your writing can't improve through just writing more.
Nonfiction writing is about the intersection of writing and the real world.
As a result, your writing will only improve if your experiences in the real world improve.
For example, no one reads a book by Richard Branson for his amazing writing. They read it for his stories and experiences. Chances are, he had a ghostwriter produce it anyway...
The same goes for Peter Thiel, Mark Ecko, Tina Fey, or any other famous individual who wrote a book or autobiography.
We don't read it for their writing.
We read it for the story and lessons.
With this in mind, your goal as a nonfiction writer is not to just write more.
Your goal as a nonfiction writer is to learn more, have more experiences, and to become someone who people want to learn from.
Your goal as a nonfiction writer is not to write better.
Your goal as a nonfiction writer is to become someone worth reading.