I always suggest authors keep several things in mind when planning to publish an ebook. First is determining the author and reader motivations.
In reality, the practice simply took on a different form. The new era of author branding uses a famous author as the billboard and very carefully positions a secondary contributor as the actual writer of the piece.
No matter what we write, we want our readers to take value away from the experience of reading our words. That value can come from a well-defined argument, a descriptive narration that inspires, a clearer understanding of a process, or a precise sense of a comparison or contrast.
The bane of good literature is NOT self-publication; it is a lack of proper book marketing. If no one knows about your self-published book, no one will buy it, regardless of who puts it out in print!
Thanks to the Internet, the release date of our published or self-published books no longer matter as long as the books are available online. We can continue to market our books indefinitely.