OUTPUT pin is not going LOW in 555 timer IC
When you connect pin2 to the GND you should then disconnect it otherwise the internal RS will be always set and the output will stay high. Try to close and directly open the switch and wait. In fact, closing the switch is just set the output then you must open it to wait for the reset.
Since you mentioned in comments that you de-soldered the capacitor from old light bulb and capacitor is having value , 82uf 500v, I guess it is an aluminium electrolytic type. This is a polarised capacitor and if you operate the aluminium electrolytic capacitor with wrong polarity it will act as a short circuit.
To test if the problem comes from the capacitor then after closing and opening the switch just disconnect the capacitor and the output shall become zero. If this happens then either the capacitor has wrong polarity or it is defective and you must change it.