Allow me to point you to this awesome post by Beth Kephart on getting a novel unstuck. A sample:
you're not completely sure about how to carry your dreamy idea about
the story through. Do you sit? Do you moan? Do you eat all available
chocolate? You could, but here is something else you might do ..."
have used the strategy she describes, and found it helpful. I doubt
there is any single writing tool that works all the time for everyone,
but it's worth a try. (And there's always the chocolate.)