The cancellation of Z: The Beginning of Everything was most likely due to a combination of factors, including low ratings, high production costs, and creative differences between the show's producers and its network, Amazon Studios.
Z: The Beginning of Everything starred Christina Ricci as Zelda Sayre, the celebrated but infamous Southern socialite who married F. Scott Fitzgerald and became one of the most celebrated women of her generation. The show was critically acclaimed but struggled to find an audience, averaging just over 500,000 viewers per episode.
its first season. Meanwhile, the show's production costs were reported to be around $10 million per episode.
It's possible that Amazon Studios decided to cancel Z: The Beginning of Everything due to a combination of low ratings and high production costs. Another factor may have been creative differences between the show's producers and the studio.
Some reports indicated that the show's creator, Tim Amazon Studios was not happy with the direction the show was taking under its new showrunner, Jill Soloway. It's possible that the cancellation was a result of these creative differences.
https://www.vulture.com/2017/09/why-was-z-the-beginning-of-everything-canceled.html