INCLUDE METADATA!
Metadata is absolutely critical to promoting your eBook. Metadata is data about data. In the case of your eBook, it means information about your eBook: title, eISBN, author, publisher, language, subject, etc. Kobo Writing Life and Kindle Direct allow users to input metadata during the upload process. If you're using PressBooks or other software to create your eBook, search for "metadata" in the help to learn how to include these vital bits of information. For more information on metadata, see this blog post.