Mindset For the Game
One good way to avoid inconsistency within a round is to try and measure
your progress slowly, hole by hole, and shot by shot. Don't project your round from say the 5th hole to the l6th hole. It takes time just to get past the first nine.
Concentrate on the holes on the back nine only when you get there. Mentally play the hole and shot that you are currently on.
To do this you must learn to play every shot as if it stands alone in time. Players need to realize that the shot you just hit poorly just as well could have been hit years earlier. It shouldn’t have any bearing on your next attempted shot, unless you let it. But many players talk themselves into future outcomes, based on prior results. This will only cause added pressure to your game.
If you go back to what your mental concept is and what you are trying to do on each shot, you won't let a bad shot affect your next one. Then, and only then will you be able to stay in the present and be able to play one hole and one shot at a time.