The thing about perfection as a goal is that you never get there. That’s why perfection is the enemy if you want to write and publish a book.
There’s always one more fact that will improve the book. You can always do one more edit. The concept of the Perfect Book can draw you on forever if you let it.
The only book that will give your career a boost is the one you write and publish, so you have to get on with the job. Chase excellence instead of perfection. You can catch excellence.