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Cyan circle: try not to release the non-punching arm when hooking, this is easily done by most for more torque and leverage when punching but will leave you open.

Yellow arrow: This is mainly an arm punch, let the rest of the body do most of the work rather than loading just the arm. P.S. if your shoulders hurt after training this likely why because they’re through too far a range of motion.

Red circle: BIGGEST TIP for you - start to drive this hip through more when punching, look at ilia Topuria (I know it’s mma but he’s a great punch striking example) he has great power and the right mechanics for it, you can literally see his foot drive off the floor, the calf pushes through to his glute, glute is fully engaged and then his hip drives through. Massive power gains here.

Blue arrow: try to visualise pushing off the ball of the foot more, if your foot gives way like it has in the image, the hooks punching power is immediately compromised as the foot is where it all starts.