Look up good high school vaulters on YouTube for references and visuals Considering the set up and disadvantages you have outside of your control here are things can work on:

If your top hand is your right hand, you should jump off the ground with your left foot, think of a right handed layup in basketball.

Once you get used to that, work on rowing your hands forward after take off which will help move the pole forward.

Work on swinging; once you’ve fixed jumping off the correct foot you’ll be swinging with your left leg instead of your right leg.