Try this next time. I did it with tennis. Every time you are about to dribble or hit a ball in soccer, imagine your tangerine on your head. Also, go into your photo-focus state. Suddenly, I think, you'll be calmer, your instincts will get better, you'll see your opponents and the 'lanes' to go around them better. Your shot to hit the ball will be better. Etc, etc.
I did this with tennis. Also, I would state my purpose "The purpose of playing tennis is to be able to have excellent return serve" or "The purpose of playing tennis is to have an excellent serve."
I didn't become a champion player but I did play much better.
Try it.