Focus on writing a great climax
The climax is the action the protagonist chooses to take after facing the moment of crisis, where he or she is pushed to the edge with no way out.
–Candace Kearns Read
(If you need to ‘cheat’ and take a previously-written character or plot for this one, that’s fine. If that helps you move through the early parts of the story quickly enough to focus all your energy on writing a great climax.)
This is a great moment to show that thing I’m always banging on about: the journey of the character. How has she changed since the beginning of the story? Or how have we?
Remember, the climax is not the resolution (that comes tomorrow, sob!). The climax is action packed (even if the action is internal, or is, in fact, inaction). No wishy-washy stuff here. This is the moment to let your characters shine.