The short answer
Your handicap is the average of your best 8 of 20 rounds, and each hole is capped at a Net Double Bogey. So the fastest way down is not more birdies, it is more good rounds and fewer disaster holes. Track every round and the pattern of where you leak strokes becomes obvious.
What actually moves your handicap
Most improvement advice talks about your golf. Useful, but it skips a step: your handicap does not measure your golf directly, it measures a specific slice of it. Knowing which slice tells you where effort pays off. Two features of the World Handicap System do almost all the work, and most golfers train against neither.
You are competing with your own best 8
Your index is the average of the lowest 8 differentials in your last 20 rounds. That means an average round changes nothing; only a round good enough to enter your best 8 moves the number. The practical takeaway is that consistency beats heroics. Raising your floor, turning your typical round into a slightly-better-than-typical one, feeds the best 8 far more reliably than one spectacular card you cannot repeat. If you want to see whether a round would have made your best 8, work out its differential and compare it with the ones you are already counting.
Kill the blow-up holes first
Here is the lever higher handicappers almost always have, and almost always ignore. For handicap purposes every hole is capped at a Net Double Bogey: par, plus two, plus any strokes you get there. A triple or quadruple bogey on the card is already only counting as a double in the maths, which tells you something blunt: those wipes are pure, recoverable loss. Turning two blow-up holes a round into bogeys can lower the score that counts more than adding a couple of birdies, and it is far easier to coach. Lay up out of trouble, take your medicine, and protect the card.
See exactly where your strokes go
Track every round and the leaks show up fast.
Play the right tees and post everything
Two quiet ones. First, play a set of tees that suits you. Your differential already accounts for course rating and slope, so moving to tees that let you reach greens in regulation does not cheat the system, it gives it cleaner data and usually better differentials. Second, post every acceptable round, not just the good ones. A handicap built from a full record is more accurate, and the system is designed so that ordinary rounds cannot hurt you, since they fall outside your best 8.
Track every round to see the leak
You cannot fix what you cannot see. Logging hole by hole turns a vague sense of where it goes wrong into a clear pattern: the par 5s you keep doubling, the stretch of holes where the round unravels, the putts that slip. Golf Handicapp keeps your best 8 of 20 current, applies the Net Double Bogey caps for you, and shows the trend and distribution so the next stroke to save is obvious rather than guessed at.