Redo two books

I'm looking to have two educational books revamped and released again in an e-book format! Currently, the two books are in e-book format. I'd like to keep the same content, but get a refreshed version done, complete with formatting and upgrade to any additional media as needed. The new e-books should be designed to reach a wider audience with a modern and aesthetically pleasing look, easily readable on any type of device. The finished product should be an engaging read with a clear aesthetic, making it reasonably easy to connect to the content. The e-books should also include a navigation guide and organized chapter and page numbering system. I want to have the editable version of the file as I need to look and edit