You have checked the obvious - batteries in your remote?
Failing that, I wonder if somehow your remote and the drone have become unbound? Follow these steps:
1) Turn off everything (drone, controller, cell, wifi)
2) Turn ON the drone ONLY
3) Flip it over and look for a blinking red light on the bottom - it's also a recessed button.
4) Depress the button/light with a skinny tool (Pen/Pencil/small screw driver)and it should turn orange/yellow
5) Turn ON your remote - the light on the drone should go out.
Now turn your drone back upright, move to a safe location and move both your joysticks simultaneously towards the bottom middle "corner" of their range. Hopefully the motors will start up.