Concentrate/Focus on the ball a full 60+ minutes.
At practice, when you are out of the net resting, strengthen your concentration skills by staying focused on the ball at all times. Reset for each rep as you would if you were in goal.
When watching other teams play, find that ball and don’t lose sight of it. Stay focused on the ball for every second of every minute.
First try it for one period, then two periods, and so on. Anytime you have an opportunity to strengthen your concentration skills - do so.
“If you can see it, you can save it.”