Tail lights not working

[Drum]

Hi! I recently had a problem with my fuel flap release cable, and I fixed it, but I think while doing that, although I tried to be extra careful not to touch anything else, I messed up some cables, as my rear lights stopped working. When I turn on the headlights at night, my rear lights are supposed to be on, but they are on only on the passenger side and not on the driver side. All the three bulbs are off. However, the light blinks on that side when I turn left and goes on when I brake. I went in there to check that all the sockets are secure, the wires seem to be connected well, no corrosion anywhere. What could be the problem? That's on a Toyota Yaris 2014.