Connection Woes

Hello

I’m struggling with my DJI mini SE drone. I used to turn controller and drone on and with my phone connected to the controller, my fly screen would automatically appear and I could fly.

I can’t fly now. I do the same as above but my phone does not connect and show the flight screen. I have opened the Fly App, and it says “not connected”

I tried to use another C cable without success, and now I don’t know what to do. Can someone please help me to get in the air again?

Best Paul