NPN low transistor voltage in emitter despite high voltage collector
Here's a tip. Try not to put a load on the side of the BJT transistor's arrow unless you're doing something more weird.

Your circuit is not turning on because in order for the transistor to turn on, the current from the base to the emitter must be sufficient. However, in your circuit, the LED strip is in the way so current can't go through therefore it doesn't turn on.

If your LED strip is purely just LEDs and doesn't have a voltage rating but rather a current one, then you will need to include the resistor marked with the asterisk and looks up some LED ohms law calculator.