1. Export the whole of the story to HTML in a location where you can look at it in your browser. DON'T browse it yet.
2. Leave it strictly alone for three days. Go do something else, the more mind-filling the better.
3. Do a browser run: read a few tales here on BCTS, see what else is happening in the TG underground, maybe even head over to Slashdot if your interests go in that direction. Get caught up in the browsing rhythm.
4. Now sit down, relax with your preferred "I might just get moving or I might not" beverage, browse a bit more, then browse that story. Read it through like someone else wrote it, trying not to remind yourself of what comes next.

I often have a half dozen or so stories in various states of disarray, inching towards completion. I have a script that converts the plain text in which I write into HTML and posts it to a web-server on my LAN.

When I focus on a story, reading it in the browser, I usually pick up its rhythms and voice, and then I find places where things need to be said, or completed, or expanded. It's the "fresh eyes" principle applied in solitary. Alternating as I do, I inch along in each story, feeling my way; browsing the one tale, you might find your muse hooked on the story and ready to go back to fulltime work.

(I also find tons of typos that way.)

fwiw