Click these links to learn more…
The World’s 54 Largest Publishers, 2017:
https://www.publishersweekly.com/pw/by-topic/international/international-book-news/article/74505-the-world-s-50-largest-publishers-2017.html
Leading online print book genres in the United States in 2017, by revenue
https://www.statista.com/statistics/322187/book-genres-revenue/
2018 Book Industry Predictions:
http://blog.smashwords.com/2017/12/2018-book-industry-predictions.html
Amazon Author Rank:
https://www.amazon.com/author-rank
Amazon’s relationship to you, as a writer:
https://newrepublic.com/article/142616/amazon-steps-battle-book-industry
AND, consider a new hobby for when you are successful:
http://www.businessinsider.com/billionaire-hobbies-of-richest-people-in-the-world-2016-8#11-footballsoccer–131-10
(P.S. My hobbies are computer gaming and training cats to fly.)