I have a set up in my living room where one switch turns on/off the electricity for another part of the living room.
This is the switch
When I turned on this switch, the part of the living room in the following picture gets electricity (the switches shown, and plugs work as expected)
I don't know what happened but the switches no longer work. I believes it fits in the timeline when we had a power outage, but unsure.
The question is: how can I diagnose what is the issue and fix it? I've tried resetting all circuit breakers with no luck

