Prevent Blunders:This is your top goal before winning preventing blunders can make the position equal
Look for a better move:When you see a good move look that makes you look like Hikaru Nakamura look for a better move that makes you look like Garry Carlsen
Study Middle& End games: In the opening most players at a 2000 below rating are excellent but when it goes to the middle and end game they fall down .Jose Raul Capablanca said in order to be good at the middlegame you need to be good at positional strategy but most players lose to tactics when you reach 1700-1900 elo then you can learn positional strategies