You can't practice the ball quickly. According to your hardware conditions, if you put it in junior high school, you have great hope of entering high school by basketball, but it is almost impossible to go to college by basketball. Your jump is not ordinary, but very bad (for a basketball player). 1.7 meters of junior high school students can grab boxes with both hands. Also, tight defense does not have to rely on speed to get rid of it. The important thing is to use your body and fake movements. You can watch Deron play, but the height of 183 is still very advantageous. You can properly practice calf muscles to enhance explosive power.