Play with a beginner's mind.
Remember your experience as a young student? You were eager, curious, alive, open, engaged and, above all, real. But, as you grew older, your focus shifted from learning, to proving yourself, on knowing the right answer, scoring well on tests and comparing well to other students. The pure joy of the learning process gave way to the importance of producing results.
Golf is a game of results and outcomes, as well. Every stroke gets scored, good or bad. Every swing gets scrutinized, right or wrong. Over time, this desire to play better and lower scores becomes a preoccupation, which adversely impacts how you feel and perform.
New clubs, new balls, new foursome, new course - you can change a lot about golf routine, but in order to change your game, change your thinking about it. Do what the pros do. Become a student again.