I was in a plateau for 4 months at 170 lbs. and the most important part I learned was to be patient and keep my motivation alive. Remember that your body is doing awesome things during this plateau....for one, you are losing inches, you have more energy, you feel great....these things cannot be felt on the scale.
I did find that measuring my portions is what made me finally break my plateau. I didn't think it made much of a difference, one heaping tablespoon of peanut butter as compared to one regular tablespoon in a measuring spoon. It makes a big difference, 40 calorie difference and because I had eaten PB through out my weight loss and never measured, I didn't think that's what it could have been, not to mention the other foods I wasn't measuring.
I was losing weight before with my heaping PB....but now that I am smaller, it is important to measure, measure, measure.Take a look at your nutrition tracker and try and cut bread and pastas just for a week, my carb intake was really high and making this small change helped....just for a week though and then go back to half the intake.
As for my exercise, I couldn't push much more, I was literally doing 3 hours of cardio per day. So I cut back and started walking a couple of hours a day. This helped as well, although it was hard to drop my entire routine for walking but my body was used to the cardio I was doing so I had to change!
Hope this helps! The good news is that when I broke the plateau, the weight I had gained 6-9 pounds flew off quickly, in like 2 weeks...now I am back on track!