The Fall sequel falls

Well the sequel to The Fall is going nowhere fast. I end up just staring at my laptop screen and wondering what to type next. It's very frustrating. I know where I want the characters to end up and I know all the plot twists I'm eager to write but I'm starting to fear I can't get it down in words. I told myself that I would not falter on writing this sequel and instead I've ended up coming up with a whole new idea for a new novel which my mind is telling me to write NOW.