If you are not in the red you can close and stay without loss, if in the red it is better to consult with a competent specialist to fix the loss or wait for a raise. What time period.
December 2017 is the phenomenon of bitcoin, reaching a record high of 19,796 USD. The bitcoin owner wants to sell all bitcoin and enjoy life as a millionaire. But human nature is greedy, holding on to expectations that prices continue to rise. It turned out that after that it went down continuously, until now in the price range of 6,000 USD.