I would be careful shorting ETH or even BTC next week or the week after due to the fork on Feb 28th.
As history has it most of the Bitmex alts usually end up pumping prior to the fork and then right before the fork they come crashing down trapping many retail traders and causing a huge sell off.
Basically what happened before where it failed to break $160, then the fork got delayed due to the bug and caused a big dump.
Are you sure there is exact date for the upcoming fork which is on Feb 28th?
No wonder if ETH price now is increasing above $130 in coinmarketcap, i think i'm gonna buy some.
But if this getting delayed again, the dump maybe will be worse than the previous.
You can dump it a week before the schedule, I'm expecting the price will continue to rise but to be safe, just take it short term
and take profit when you can. Remember that part of the rules in trading is that, buy on rumor and sell the news.
I hope I can help, but if you go for longer, then it's your decision, ETH is undervalued anyway, price should be over $500.