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.
You made a right decision of keep on holding your Bitcoin as what is the point of selling it low right now in which it will just ensure the losses of your capital, atleast by keep on holding there is a higher chance that you will take back your former lose and earn more as Bitcoin is have been in this difficult situation so many times before but still survived.