Below are informational links about the Bestseller Lists.
The convoluted world of bestseller lists explained.
https://www.vox.com/culture/2017/9/13/16257084/bestseller-lists-explained
The Dirty Secrets Behind the New York Times Bestseller List
How Bestseller Lists Actually Work — And How To Get On Them
The murky math of the New York Times bestsellers list
My advice to writers is don’t dwell on the bestseller lists. Write your best books, hire professional editors, get your book professionally formatted, hire quality illustrators, work hard to get reviews, and gain knowledge in keywords and advertising with Amazon. You’ll get to be a best seller through sheer hard work.