Learn how to play different courses and learn to play under different situations. You get golfers who are home track heroes with a 2 or 3 handicap at home, and they go to another golf course and can't break 85. Learn to play different environments including different times of day. Play the game the way it's set up to play. The short game is where amateurs lose shots.
Amateurs take more shots around the green than they do getting to the green.
You can only do that by practice, trial and error, different club selection, and imagination. You need to feel different shots. Learn how to play those shots. There's more than one way to hit chip shots. You've got 14 clubs, you can use them all.