LMAO. The weight gain and loss were deliberate (bulking and cutting. I hope you've heard of them). When hour weight loss stalls, you slightly decrease calories and once calories start becoming too low, you take a diet break and increase calories for some time. Once leptin, test and other hormones get back to normal levels, you go on a deficit again. Once your weight target is reached, you compute your new TDEE and stick to that.