I honestly can’t imagine what else can be done in The Witcher universe, so I’m actually kind of content with it just being a trilogy. If i had to guess on one thing, I’d like to see more Ciri adventures, either with her younger self or not. Also, more Geralt in a bathtub, of course.
As long as the world is Yennefer-free, I'm down.
If they want to make something within the same universe, that's cool to me. I just hope it takes place from a very different perspective. Do something surprising and different. Maybe something less action-focused.
I can't fully describe what I'd like them to do without spoiling the games so I'll just say this: Ciri. I'd like a game set in the same universe with her as the protagonist.