The best way to preserve vinyl would be to install paint protection film over the top of it. This would add a layer of self-healing and UV protection over the vinyl. Swirls would be prevented, as would fading or marking from the environment.
Another way to help preserve the vinyl would be to ceramic coat it. This will also help with UV damage and environmental exposure. But will not protect against chips or swirl marks.
If you do not want to go with the added expense of the above options the main things would be keeping the vinyl wrap clean and minimizing sun exposure. Leaving dirt or water to dry on the film can discolor and mark it. As can leaving bird droppings. Sun exposure will cause the vinyl to fade and crack over time.