The leaves are all off the trees. My neighbors lights work and don’t get as much sun as mine.
I’m curious how old the lights are, or if they used to work or not in their current location. This information would have been helpful.
Solar lights operate by recharging Ni Cad batteries that are inside the unit. The Batteries are usually size AA. The batteries don’t last forever and need to be replaced every year or so.
I would replace the batteries to see if this corrects the problem.