The short answer is there were issues out of my control. I am working on the last book now. I'm uploading chapters to Wattpad. This is a first draft. The final version will be different. This draft will give you an idea of where things are going. Also, you can comment and ask questions.
We're all different, but for me, I don't believe in writer's block. Sometimes I don't feel like writing, or in the middle of a book I start to lag, or I'm just plain lazy. You have to keep writing.