lm7905 LTSpice is not working
This might not be a 100% correct component model. However, you're not loading the output, and without any resistive load, the LM7{8/9}xx series isn't known for accuracy.
So, add a 1 kΩ resistor from OUT to GND, and observe again.
If it still doesn't do anything, either the SPICE model is wrong, or you're not actually observing the right node.