Little short to $13'000 level is due. Possibly, the price is decreasing even further; you, just lock in little profits from time to time; big time-life changing trades do not exist unless your name is G. Soros.
Personally, I'm holding a put position with strike $14'000 and expiration 26DEC18, in the hope of opening a put spread, possibly arbitraging a self-financed portfolio (meanwhile, of course, I'm long the underlying).
I'm expecting this guy to flash crash and rebound in the $11'500 level.
ATTENTION: shorting bitcoin is so very dangerous, please use a stop loss.
Trade responsibly.