What else to do to lower the cabin temp?

Cabin overheat protection has been on lately in SoCal when set at 100º F and eating my juice. I have:

- Llumar tint for windshield, all side windows.
- Umbrella style for sunshield for more heat reduction of the windshield.
- Shade with thin insulation taped to it for roof top.

Any suggestions to reduce the cabin temp?