No this the time to buy bitcoin not to sell. This dip is temporarily not continue for long time. Because the pump and dump are common in this field. If you have huge amont of bitcoin means better you can hold for future. Bitcoin price will come back with massive growth again in the middle of this year. Dont sell bitcoin right now. According to CMC again there will be  huge growth and the price will touch the moon. So hold with patience and wait you will get more profit.