Keep your rigs off, if you Can't handle the low's and HODL sell the GPUs. I mined ETH through The Iceage, low of $182 back in Aug and its high in Jan, follow by it near market crash at 400-500. I kept all 72 RX 580's mining ETH the whole time.
I mine the ETH when there is profit. If the profit is low, I will make the rig to be more efficient.