Writing a short story or Can I take that Nanowrimo story and actually finish it?

I am wondering if I should take my NaNoWrimo story and try finishing it... I am not sure if I am in love with the topic or if I should revamp it. I love the character Lacy and her psychiatrist. I love the Title : Confession of a Habitual Liar. But, I might have to change the format. Right now it is in letter writing format. I need to re-think that.