Until now I have selling my Antminer S5s.

Should I consider restarting them?

Electric here is 14 cents per kW.

EDIT - Happened to thing of this handy calculator

https://www.cryptocompare.com/mining/calculator/btc?HashingPower=1&HashingUnit=TH%2Fs&PowerConsumption=500&CostPerkWh=0.14

It does not look promising.