The beginning quarter of your story informs the end and the end informs the beginning. Forget all you've written of the middle for now. Focus on the how the beginning and the end thematically support each other, how the beginning foreshadows the end and how the end satisfy the intent you established when writing the beginning of your story.
See you December 1st and the beginning of PlotWriMo blog tour to re-vision your story.
For plot help and resources throughout the year:
1) The Plot Whisperer Workbook: Step-by-step Exercises to Help You Create Compelling Stories
2) The Plot Whisperer: Secrets of Story Structure Any Writer Can Master
3) The Plot Whisperer Book of Writing Prompts: Easy Exercises to Get You Writing.
To continue writing and revising (and, lots of writers are finding PlotWriMo the exact right resource to help pre-plot for a powerful first draft. Knowing what to look for in a revision helps create a tighter first draft):
View your story in an entirely new light. Recharge your energy and enthusiasm for your writing. 8 videos (5.5 hours)+ 30 exercises