Why can't we rebuild the ozone layer?

Could you elaborate on the complexities involved in attempting to rebuild the ozone layer? Given the intricate balance of our atmosphere and the delicate nature of the ozone layer, what are the key challenges that hinder such an endeavor? Is it the technical limitations, the environmental implications, or a combination of both? Understanding these nuances is crucial for us to appreciate the gravity of the situation and the need for alternative solutions. Could you provide a concise yet comprehensive overview of the obstacles we face in this endeavor?