AI Novice with a 80% completed fantasy novel. How can I use AI to complete my work?

As the title says I’ve written a fantasy novel starring my two daughters and I’m stuck with writer’s block as well as time constraints and I’m wondering how could AI help me complete this work. I started this in 2011 ( they were 7-9 at the time) and life and fatherhood has gotten in the way, now I’m at the point where access to an AI tool would be an answer to my prayers. I have no idea which system to use so any recommendations would be greatly appreciated.