I am 21 yrs old, may height is 165 cm and my weight is 150 lbs, what natural practices could i do to gain more height?

No growth last year?: If no growth in the last year, then growth has finished. Most people reach their maximum height in their late teens. Without nutritional problems or chronic childhood illnesses, height is largely based on genetics and parental heights. Aside from eating right, exercising, sleeping well, and being happy, there's not much a person nor his doctor can do to increase height.