As my work, is coming to an end

BOOK 1
I was giving a thought what happened in my book and have I resolved it??? Turns out I am the most evil character of my own work. Anyways, I was thinking about that one major issue of my novel, i.e., The split (Literally a barrier that splits the planet in half, restricting one side to access the other) and the other major issue - Headhunter (Man tearing monsters.)
As of the current status both of these issues are unresolved.
So I would like to know - What is that one core issue/s in your story and have you resolved it or not????
Link to my work