While there’s always more to say on the subject, you might be interested in these answers to related questions:
How was Caesar's "Gallic War" created and distributed? by u/XenophonTheAthenian
There were no publishing houses in ancient Greece & Rome, but Seneca, Xenophon, and Ovid became famous through their writing. How were ancient works distributed, and was anyone making money from the industry? by u/toldinstone
How did book circulation work during the time of Plutarch, or any civilization in the ancient western world for that matter? Libraries, book stores, book publication? How would an author even go about publishing their work? by u/Tiako