This is talked about over and over.
Ther eis no secret. it is course management and picking up the birdies where you can. If you dont birdy the first hole you give up an easy stroke there for example. Not every hole can be birdied, but they can all be tamed with a par.
I shot 6 birdies, but 5 bogeys. i gave up 5 strokes with the bogeys.
Pick up the birdies on the holes you can, and a 64 is very doable. it requires proper choice of shot and perfect execution. There is no secret, no cheating, no bullshit. Click on one of the top players profiles, and then go to their stats and their driving average, you will see it is same as others.