Have you read Benjamin Blatt's book, "Nabokov's Favorite Word is Mauve"? He compiles dozens of bestsellers, loads the text into computer programs that analyze the vocabulary, the number of cliches, the use of cliff hangers, etc. and discusses what makes a bestseller. https://medium.com/honest-creative/one-book-that-will-make-you-a-better-writer-2a939af1b2dc.

I'm definitely going to pick up a copy of The Bestseller Code. Thank you. (I'm an honest nerd. I think the science of bookselling is fascinating!)