Of all the many factors that influence the results that you achieve on the golf course, the factor that will make the biggest difference to you is how you manage your frustration when things don't appear to be going your way. The easiest thing you can do is get upset about a golf shot and carry the anger and frustration with you.
One of the mental confidence skills that pros that play golf on tour develop is a high tolerance for frustration. Frustration is a form of stress, and reacting to it negatively can literally set off a chemical time bomb inside you that erodes your confidence and propels you spiralling into a negative emotional cycle that seems to have no end.
Purchase a two-piece ball which 'feels exceptional'. The sole way you can identify how a ball feels is by way of several trial and error. Opt for a multi-layer ball if you're trying to constantly break 80. Those balls are altered constantly. Any golfer who plays in the low 70s can think about spending in a training session with a wedge, a driver, launch monitor, and a lot of balls. Touring professionals utilize such sessions to 'fit' balls on their apparatus and swing.
The other short game tip is to maintain even grip pressure throughout the shot, especially coming down into impact. Because these shots can be delicate, we get nervous and tense up just before we hit the ball. This almost guarantees you won't get the result you wanted. Practice short shot swings, without a ball, feeling the pressure in your hands staying constant from takeaway to follow-through, and especially just before impact.
Another vital factor to be considered during chipping is to avoid chunk shots. This type of shot generally occurs when the club hits the ground in full force and not the ball. This will prevent you from hitting a chip shot and also the ball will not move in the desired direction.
Now to putting. Your putting stroke needs to be smooth. I see recreational golfers who jab or poke at the ball and none of them are any good on the green. The best way to keep a smooth stroke is to take the putter back low, let it swing through the ball with a natural rhythm, almost like the putter is moving itself, and keep the putter low on the follow-through. Low back, low through.