Yes, dear WriMos, we're in the back half of the month. Ideally, you should be beyond 25,000 words (I'm not.), and well on your way to 50,000 words.
Are you getting tired of your story? Perhaps you feel it's not going anywhere? Maybe you're past the NaNoMoon, and into some of the more tedious writing, which is slowing your word count. So what do you do when that happens?
If you find yourself a bit "blah" about your story, now is the time to spice things up. Add a character. Change the setting. Create a new conflict between existing characters. Do something different with the plot.
Do whatever you can think of to make some kind of change wherever you are in your story. It doesn't have to necessarily fit. It doesn't have to be logical. (That's what editing is for, remember?) All it has to do is get you writing again.
Keep writing, friends. We're nearing the end of the month. It may be a bit scary, but remember there's still a holiday weekend to boost your word count! (Are you fortunate enough to have Thursday and Friday off? In that case, you're set!)
And whatever else happens, no matter what your word count on December 1st, it will be higher than your word count right now, and it will be higher than your word count on November 1st, and it will be higher than your word count on October 31st. Just keep writing!