How Do You Improve Your Eyesight? [namely Astigmatism]?

Is there a way you can improve Astigmatism? Ive reached 300 and I’ve been told that the corrective glasses and lenses are out of the question. I cant take surgery since I’m not even 15. I was wondering if there was a natural way of improving my eyesight.
Another random question, does astigmatism somehow make you cross-eyed?