move 100% of books to ebooks and make them as obnoxious as possible. start adding things like loot boxes. pay a dollar to read a TOP SECRET crucial bit to the storyline that you simply wont get the Full Book Experience (tm). give it Social (tm) capabilities. show indicators where everyone else is reading and allow comments on any sentence in the book. feature self facing cameras on the ebook so you can live stream yourself reading. Allow users to Like your live streams and display metrics on every page.