My refridgerator is not as. my refridgerator is not as cool as it use to be and the freezer is not

Question

my refridgerator is not as cool as it use to be and the freezer is not freezing all that hard it completly melted 2 days ago and now its making ice cubes hard. I checked the power to the compressor and its working i also checked the power to fan I have power to fan. The fan doesnt seem to be kicking on Does all the wires have to be connected in order to have compressor and ice maker, and fan. Thank you Mary Im not sure how often the fan kicks on or does it stay on The only thing that I can seem to get is there isnt any