Number 1 thing I wanted to suggest for this game would be better animal behavior! It's extremely disappointing to me when games have this concept of predators just attacking loudly and indiscriminately, acting like Video Game Monsters, especially something scary and unfamiliar like the player. (At least the herbivores aren't uniformly passive...) I do get there might be lore reasons (I'm quite new to the game so I haven't gotten very far into that aspect) but it's just something that always makes me a little sad haha especially in something meant to be more realistic. Predators in real life don't just randomly attack anything that walks by them, they need to consider energy use very carefully considering how much effort hunting is.
I really like the idea of seasonal changes in behavior & territory mechanics that vimasa mentioned. It'd add a nice bit of depth to the game, I think.