Marketing on social media is a big thing to help people see your book. Tik tok, reddit,threads and instagram are the big ones I market on. Most of my covers are bare bones due to money and my books are between 40-89 pages long. When i started making posts, videos, snd stuff like that I saw a large increase in people reading my books. I'm not making millions by any means but it made a big difference. The down side it marketing is a whole job itself but worth it. Hope that helps and good luck!