As in indie author do you submit to book awards? It's one marketing strategy that might be a long shot, but if you win, it could pay off. I often enter my books into book awards. Here are some of the winners!
I think the Eureka! link has changed. This one worked for me: https://californiareading.org/eureka-children-s-non-fiction-book-award
Submit to Book Awards!
I think the Eureka! link has changed. This one worked for me: https://californiareading.org/eureka-children-s-non-fiction-book-award