Hello, it is pretty common to weight gain after pregnancy due to hormonal changes, since your Thyroid hormone levels are normal, yes you can reduce your weight. Daily 30min of exercise (if you are allowed to do) morning and evening (either brisk walk, light jogging, aerobics, cardio workout, cycling, or treadmill) along with dietary control, reducing your daily calorie into 75%of your current intake, avoiding all oily and junk foods, Eating more of fresh fruits and vegetables, and avoiding stress and good sleep will help to reduce weight.