Cooperative Variants.
If you need a leg up on the bots and feel adventurous, you might try treating all the humans' pieces as on the same "team" in various ways, such as combining them when determining who rules clearings. When doing this, you'll need to make judgement calls about certain interactions
(e.g., can the Lizard Cult convert a friendly Eyrie warrior using a conspiracy?). There are many such interactions in Root, and we'd encourage you to err on the side of challenge.