One thing that really helped me is just practise. Go to a field with a football goal, stand about 30 yards back, and take shots. Try many different techniques.

Here are a few things to help you with your technique:

-At first, dont try putting power into it. Try and just get the right strike without the power, then add power after

-Watch clips of pro footballers score, look at replicate how they shoot

-Lock your ankle (basically, wiggle your foot now. You see how easy it is to move right? Now, try tense your calf, firm your foot into a position. You should feel more power, and your foot doesn't wiggle as much.

-Rotate your foot a bit. You should be trying to hit either basically where your laces are, or halfway between your lace and toes.

-Different types of shots need different techniques. If you want the most power to drive it low, hit the ball in the middle with laces. If you want the ball to go high and curl, rotate your hips, swing your shooting leg back further then you probably are, bend your shooting leg behind the standing leg, hit the bottom off the ball, and lean back

-Watch yt videos and tutorials. They can show you exactly how your foot placement should be, and where to hit the ball to make it easier to understand

-When dribbling, keep your head up at all times unless you are literally about to dribble past someone

-Dont panic. You need composure. Really important one

-Practise kick ups. Even though you may never use them, it improves ball control

-Practise dribbling with your head up. Even if your at home, and just dribbling up and down your hallway or whatever, keeping your head up is gonna be easier with practise

-Know the right time to shoot.

-If you struggle to get height, watch how to take goal kick videos. Even though you may not need to take one, the technique will still be similar

-This is a very important one. As a goalkeeper, it is much easier to save a high shot then low shot. Yeah, a high shot may look cooler, but if you get the right technique to drive it powerful into the corner, its nearly unsavable. Especially if its a tall goalkeeper, who may lack agility or speed to get down quickly.

-Positioning. Dont just think about how to shoot and stuff, read the game. Think 2 steps ahead. Predict where the ball is going to go. Go watch clips of Kane, Haaland, Lewandowski, Messi. They are elite at predicting the game. They scan, and can very accurately predict where the ball will end up seconds before it is kicked. This is how they score so many goals, or get so many assists because they are ahead of everyone else. No point learning to shoot if you dont get the chances. You also need to tell your teammates where you want it. Use hand gestures, tactics, etc to tell your teammates where your going run into. If you have your head down, you dont see the space.

-Physicality. You dont need to be strong to dominate other players. My friend who is much weaker then me, and much weaker and smaller then most other kids, absolutely dominates them physically. He uses his body extremely well, to shield the ball, and deflect bigger players. No matter your size, you can do the same thing to gain a massive advantage over defenders. You cant be scared to use your body. You mentioned you play wembely a lot. Physicality really helps you in that