How to set the image dynamic scale in SwiftUI

I made a customized image view with a ratio of 1:3.
This view works well in most situations, but on short vertical phones such as the iPhone se, it goes over the navigation bar.
So I try to reduce the image to a small size when the length of the phone exceeds a certain percentage of the length of the phone, but I don’t know what to do.

var body: some View {
    NavigationView() {
        
        GeometryReader { g in
            
            ZStack {
                BackgroundImage("1", width: g.size.width - 40, height: g.size.width * 1.3)
                Text("명언")
                    .font(.largeTitle).bold()
                    .foregroundColor(.white)
            }
            .position(x: g.frame(in: .local).midX, y: g.frame(in: .local).midY)
            .padding(.top, 35)
            .navigationTitle("Today's")
            .navigationBarTitleDisplayMode(.large)
        }
        .edgesIgnoringSafeArea(.top)
    }
}

}

enter image description here