i think so risky if you Holding bitcoin a long time , may be just 3-6 Month it's good . but , if you already got cheap or profit you should sell your bitcoin , and waiting dump again .
I agree. I always follow the strategy to sell my Bitcoins when they reach a 'set' profit margin. Too much waiting can mean greed and then the decision making abilities are hampered by it. I would suggest to set a fixed 'profit margin' (within reasonable limits of course) and sell when the price touches that floor.