Why can’t my Air go more than 500m, please help me .

What happens when you reach 500 meters?

Check max flight distance settings in the app.

Hi caesarcooper, we do apologize for the issues you had recently with your Mavic Air. Are there any error messages in the app? We're here to help you. Thank you.

Well that is simply because you are probably flying on the 5.8 ghz range, which in Europe ( CE mode) is limited to 500 meters.
https://www.dji.com/es/mavic-air/info

Fly safely
Alex

work out with the app settings man.