What is a single plot answer you want from "Withcher 4?"

Ive talked with friends about ”Who originally lived in this realm before the convergence? " " Did the Elder Blood exist across all dimensions? " Or " What happened, in cannon, to the other schools? " But I think my biggest one is " Who is Guanter-O-Dim? "

If you have any theories on any of the other ones i've mentioned I'd love to hear them along with what you think are lore questions we can only hope CDPR flesh out in the new game.