You should know that you only consume 500 calories when you run on the treadmill for an hour, and a bottle of milk tea has more than 600 calories, so you must eat lightly and stay away from junk food.
Otherwise, everything you have done will be in vain. Everyone has different basal metabolism. The human body can't consume too few calories. If the intake is too small, the body will not adapt. On the contrary, if you eat too much, you will get fat, so you must refer to the calories of food.
Only under the premise of reasonable diet and good exercise can we lose weight. Exercise must be combined with aerobic exercise and anaerobic exercise. Simple aerobic and anaerobic effects are slow, and proper strength training can make your body look better.
So your method is wrong. Only by finding a method that suits you can you lose weight.