Yeah Vampire, kicking the ball higher at the park will make the kid a better player, lol. Just practice mate, practice makes perfect remember, do the same thing over and over until it becomes 2nd nature, try to kick on your opposite foot as often as you can too, handball with the other hand too, you'll find out down the track how much these two simple things will get you out of trouble on the footy field. Last but certainly not least, listen to your new coach and work on any problems he thinks you may have.
If you need motivation just watch this video...
kicking the ball to another family member, running and handballing to another family member, marking the ball etc Go to the park so you can do higher kicks.