When the book I want isn’t available on Libby and i don’t want to spend money for an audiobook but already have the ebook (for books on kindle unlimited, for example), I just turn on the Spoken Content feature in the Accessibility section of the iPhone and my phone just reads aloud what’s written on the screen and switches pages automatically! I usually use it on the Kindle app and I find that the voice isn’t too robotic! You can also adjust the speed