I can discourage you now or you can get discouraged on your own after a lot of work.
1. There has never been a best-selling archery book--Not by Saxton Pope, nor Robert Elmer, nor Howard Hill, nor Byron Ferguson. The market is not and never will be big.
2. Everybody and his dog is writing a book on every subject there is, those who ARE interested, have to wade through a flood of poorly written books by authors who know little about their subject in the hope of finding a book by someone like you who does know something.
3. The market for self-published ebooks has starved a lot of traditional book publishers out of the market. They used to pay fairly well. Now they are taking on very few books and only those that seem likely to sell many thousands of copies.
4. Whatever you do, do NOT pay anybody to publish your book. That was never a good idea, and now with self-publishing, ebooks and print on demand, there is no excuse at all to pay anybody to print a thousand copies for you to sell.
Jim (who is a retired copy editor and whose wife has published more than 100 novels.)