Sure, you can improve as a player by getting faster, throwing further and jumping higher. But if you have a capacity to learn, working on simple unnoticed skills can make a difference too. Like footwork.
I can think of 6 instances where good footwork can give you an advantage.
When catching a pass on an in-cut, twist in the air so as to land ready to throw upfield. Basically you are performing a 180 degree turn as you catch. Only use this when you know the defender cannot bid on the catch, and when you are catching at less than 50% of top speed.
When popping, step in past a cup or wall from the blind spot of a defender, to receive a short pass from the thrower.
When catching a simple dump or swing pass against an approaching zone cup, jump a little to catch the disc, and stick your pivot foot out as you land. The defence will come up to mark where your torso is, but you can step back wider than they predicted, because your pivot foot is already stuck out.
When you want to keep a catch in-bounds, toe-drag. Practice. And watch Rueben.
When guarding a cutter, slide step, rather than turning to move forward or back. Avoid turning your hips and shoulders until you really have to.
When cutting, decelerate in a straight line, turn, and accelerate out in exactly the opposite direction, retracing your last 4 steps. There are still Worlds reps out there who don't use this simple vertical cutting skill in a game.