you made the big investment already now you only risk the costs of electricity .
even if the cost is high it is worth the risk since you already paid for the gear and no one will buy it as you stated ..
as i see it this is the smartest move
try selling it bit by bit to reduce your risk not at less then 50% of the cost however meanwhile keep mining try to focus on new coins that look promising and wait for the next price rise if it will come ..

good luck man i joined the mining game late like yourself however with a couple of smart investments in the right coins i managed to almost reach my ROI .