I would try and feed it a piece of krill or some mysis and see if it is sticky and takes the food. Since it has little to no zooxanthella (algae) left in it it needs to digest real food to get enough energy to recover.
Other then that let it be. It is on the rocks where it should be and you definitely have enough light for it. Just keep the water quality good and it should recover and color up in the next couple months if it isn't too far gone.
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