you should check the back, it might be old enough that it has the coils back there instead of under the skin, if that is the case then add some reflective insulation between the fridge and the coils, also check the door seals, new seals are pretty cheap, $35 or so.
also, if the fridge is not already full, adding some jugs of water to it will give it mass to keep that cool in, stead of letting all it escape with the air when you open the door.
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