Need Some Writing Advice

So, I’ve spent the last two days holed up in my room finishing the third draft of my novel.  I added a great motivation for one character as a result.

However, I also began to wonder if I shouldn’t change my ending.  If I did, I would cut out the last two chapters (essentially 5000 words), resulting in I think a better cliff hanger.  But my qualms:  5000 words is a lot when my novel is only 65,000.  It would take it down to 60,000 words, which I think is very low.  Does anyone out there have any advice for me on this point?

To recap:  it’s a young adult novel and I’ve read that they are supposed to be between 50,000 and 70,000 words so I’m right in there.  I am just unsure.

Thanks for any advice out there!