Few months back i purchased arround 15 to 16 btc when bitcoin price was 10000$ to 11000$ each btc but now arround 4000$ each btc .Just waiting for 11000$ for each btc than i should leave btc and i can see bitcoin have no future in this time.
If I were you, I wouldn't get too upset and keep holding the bitcoins you currently have. Of course, it is unpleasant when the invested funds disappear, but you must understand that the market will sooner or later return to its previous positions and the price of bitcoin will go up. No one can be sure of success without personal investment experience.