If a writer wants to sell big, he has to go through a literary agent. Of course, many of them are fully taken, that is they don’t want new writers. But some advertise for new clients, and let you know if they feel inspired by your work. (Usually not.)
I recently found one in Canada, and she required a big application. I had all my material ready. She even had a photo of herself, and she looked knowledgeable and sympathetic.
Of course, I had the worst title for the book, and my wife Loretta pointed that out for me. So I changed it, and sent it again. This time I hope Loretta’s instinct outdid mine, which had been suggestive of a superiority in the writer. Don’t want that.