I m a 20 year old guy with height 173cms. Do my height will increase further? And how can I increase my height

Platform shoes. If you entered puberty the same time as your friends ; your bone maturity is 18 yo or older there is little you can do to increase your height.A single x-ray of your left hand can be assessed for bone maturity.If bony maturity is more like 15 you might grow an additional couple of inches.Medicines won't help if the growth centers are closed/finished.
Depends. If you are in your teenage years or if you are referring to a child, a good healthy diet with plenty of exercise and activity can maximize your chances to attain your full potential. However, if you are an adult, there isnt much you can do as your bones have fused leaving no room for further growth.