Im 19 ,my height is 168cm what can i do?

You get the most from this site when you provide detailed background information followed by your related question. Here there is little data to work with. A single x-ray of your wrist/hand can be studied for growth centers, if they are all closed, as most are in males by 18, you are finished growing taller. If closed. no meds/exercise/diet/supplements will change that. If open, you may grow more.