Height mainly depends on genetics and growth plates, which usually close after the late teens, so after that, there is no proven medicine (including homoeopathy) that can increase height. At 5 feet 6 inches, your height is within a normal range. However, you can improve your posture and appearance by doing regular stretching exercises, yoga, and strength training, along with maintaining good nutrition (protein, calcium, vitamin D) and proper sleep. Surgical options exist but are complex and not usually recommended unless medically necessary.