The key to success with a bunker shot is relaxation and the right set up.
Remember: Open the clubface first, then take your grip.
Set up with an open stance; meaning your feet, hips, and shoulders are aimed more left of the target. Weight favors the front side from start to finish.
Ball position is left of center {upper middle of your stance}.
Set your wrists early with zero tension. Make a generous backswing.
Accelerate through the sand ensuring that you catch sand first {that’s why they call it a sand shot}. The sand literally propels the ball out.