Do you think it will be the best time to sell as there are two kind of speculations one says the value of bitcoin will reach $20,000 by 2018 and there are also speculations that the bitcoin might go through a dump in upcoming days but i know we cannot believe into random predictions by random users due to the volatility of bitcoin but i need some suggestions whether to hold on to bitcoin or sell it out and invest some of it into altcoins and then wait for the price drop to reinvest into bitcoin which i am not sure will happen or not.
No, you should not sell Bitcoin at this time. Now is the time when the market is very volatile, you should keep them. Maybe by the end of this year, the market will be bouncing again and be stable. Be patient and be smart.