If you've been eating your carb meal and doing the workout drinks, I don't think you should go with more carbs. If anything, I'd add a little more food for a while, but if you have the patience, track for a week and let's see where you stand.
These plateaus are common. I've had them that last a month or more (not that you want to hear that).
What types of exercise are you doing? Weights. Cardio. Intervals. How often for each?
Sometimes doing more or different exercises can stir things up, too.
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