If you must go on a diet, don't go on a diet. I think the safest way for your situation is to control carbohydrates and fat. The diet is high in protein, bean products are used instead of rice noodles, and lean beef, rabbit meat and chicken breast are eaten. Diet is very important, beware of anorexia!
3, with a little low-intensity aerobic exercise, the effect is better, but because of the small base, don't expect to lose a lot of weight in an instant. Exercise 3 -4 times a week, with a heart rate of about 60% every time 1 hour, such as walking and jogging.
4, don't lose weight 10 kg a month, the body loss is too great. I suggest you aim at 1- 1.5kg a week, which is safer. I used to weigh 20 kg a month, which made people feel too uncomfortable.