If you are doing that much exercise already (and you have only a small overall body weight left to lose) you may find the plateau is from muscle mass gain rather than a true lack of fat loss. I hate the BMI for that reason. It is demoralising when you are, in fact, losing body fat and centimeters but not *on the scales* weight.

Maintain the caloric intake. Measure portion sizes to ensure you aren't accidentally getting more calories than you think. Take your measurements and go by how your clothes fit. Ignore the scales for 2 weeks and keep going as you have. Then see what has happened

As everyone has said, the short term gain (or loss ) can leave you getting an extra fat deposit when you start eating a normal calorie intake again. Not worth destroying all the positive effort you are currently putting in.