Fourth season? I only found out today
...That an animated revival of Ash vs Evil Dead was in development a year or so ago, with Bruce Campbell returning to voice Ash
https://collider.com/ash-vs-evil-dead-animated-series-bruce-campbell-comments/
Can't find anything since. And this article...
https://screenrant.com/ash-vs-evil-dead-season-4-cancelled-reason/
...doesn't make any mention of it, sadly.