First you have to have a pattern, fade draw or straight to be able to aim with complete confidence. How can you trust aim when you have no idea what your ball is going to do? It’s called “aim and hope”
The intended line of flight is not the line across your shoes, it’s the line from the ball to the target. Rail lines are a good visual, the ball flies along the outer rail, your shoulders and feet are on the line parallel to the outer rail.
This simple exercise will help you understand how you aim well. Stand behind your ball and point your right arm and finger at the pin, take your left arm and point it parallel to the right arm and you will see where your feet and shoulders actually should be aiming. Parallel left, certainly not at the pin. This simple exercise amazes players, the left arm is only 2 feet left, looks like way more than that!
Also Two alignment sticks one just outside the ball aimed where you want the ball to go, the other stick should near your toes parallel to the other stick, always practice with those two alignment sticks so you train correct alignment. Since your arms are attached to your shoulders not your feet, which of the two should be critical? Better to keep the shoulders parallel to the sticks and let the feet go where you are comfortable and balanced, many players have the back foot foreword or back from the alignment sticks, it’s ok.
The key, be comfortable, balanced and ready to swing, be happy with your aim.