How can a goal keeper improve his ability to hit the ball when for instace taking agoalkick or spot kick?

Im a goalkeeper and i almost have every thing that a deascent goalie should have in meaning the talent i can make great saves with may hands and legs penalty kick taker and stopper. one on ones. speed and everything except the abilty to hit a ball hard for example while taking a goal kick i cant weep the ball high enough to reach the opposition side like most goalkeepers do so what exercices should i do in order to improve because i was thinking of going for try outs but im afraid they wont pick me because of this so what do i do?