Height 5ft 3".i m 19 year old boy.i want to increase my height what should i do?

Depends on situation: If your bone maturity is that of an 19 yo your growth centers are closing & you are likely finished growing taller. A simple xray of your wrist & hand can be analysed for bone maturity & if it is more like a 15yo you may grow more.Good basic nutrition, rest & exercise promote the best growth.Once the growth centers close you are done.