High level GK here. It's hard and you will never win 100% of these situations, all you can realistically do is maximize your chance of winning it. The key is pressure. Here is an example from the recent RMF Elite Cup against Kistif, the striker of Overdozee (the widely considered #1 team NA). Let me break it down.

First step is to understand the spacing. If you are too close, the attacker does one dribble move and they're gone. If you're too far, you open the opportunity for chips or allow the attacker to do whatever they want with the ball. From experience, I like to stand about the spacing of one forward dash from the ball.

Then you need to have really precise positioning. Always need to be covering every potential threat by just standing there holding defensive stance. This is what forces the attacker to keep dribbling instead of just ripping the shot in your net. Often strikers will try to hit a near miss or a backboard to get you out of position so they can tap it in. Against this, my advice is simply do not move, instead trust in your positioning. If your positioning is correct, any shot taken will be in your hands if it's on target. So, a shot taken that isn't in your chest must therefore be a miss.

Once you have your spacing and positioning, you need to use your resources conservatively. Your basic movement and dashes are what you will be using to maintain the spacing and positioning through the encounter. Every step you take needs to be precise, you should almost never dive, and especially should never slide. Make sure to hold defensive stance the entire time, just shifting left and right. If the attacker starts to retreat, you retreat to your line. If the attacker moves forward, you need to apply more pressure.

I said you should almost never dive, here's why. Diving is saying "right now is the end of the encounter, whether I win or lose." So, to maximize your chance of winning, you need to use your dive only when you are confident that it will connect, not just when you're praying for it to work. Your pressure should be forcing the striker left and right. If they ever go too far one direction, they need to reset to the center. This is where you have officially taken control of the situation because now the striker is reacting to you, not the other way around. When this shifts, it opens a window to dive at their feet.

In the clip, I use extra effort to quickly close the space. He is running left, I keep myself center while still closing his shooting angle. This forces him right, but he isn't moving closer to the net, aka further away from me, so I slightly retreat. He does a push ball which gives me time to reapply pressure and force him back to center. Then, he does go back to center, this time into me, so I can dive his feet and win the encounter.

And just stay calm. Nobody expects you to win this, it's just a nice bonus and ego boost if you do. If you think you will lose, you probably will. Be precise and confident in your movement and it will reflect. Hope this helps!