There are a number of form errors that can cause left misses. If the left misses are consistent, it could be that your dominant eye is not centered over the arrow. Or, that you are “pushing” the arrow to the left by not coming to full draw. In other words, the arrow will tend to follow your string forearm; if it is at an angle to the arrow, the arrow will tend to fly in the direction your string arm is pointing. Same with your shoulders: if they are pointed to the left when you are at full draw, your arrow will tend to fly to the left.
If your form is okay, you can move the POI to the right by using a softer strike plate, such as a Martin rug rest, instead of leather or Velcro.
If you don’t think it is any of these, let us know and we will come up with some other possible reasons.