My guess is that you have a blockage in the pipe between the skimmer and the pump.
If you have a plumber's snake you can try to free it up.
Another thing that may work is called a "drain king". You can get it at Home Depot.You hook it up to your garden hose then place it in to the hole in the bottom of the skimmer.Turn the water on and it blasts water through the pipe with a pulsating or hammering action to try to dislodge the clog.
Worth a try,anyway.
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