Really depends on your situation. If you needed money then you have no choice but to really dump your coins and exchange it to fiat. However, if you have no need for your bitcoin then just hodl on it. There's nothing more gratifying than seeing the price of bitcoin going up and your money growing. And if you are thinking of selling at a certain price, then just don't do a full dump on your coins but just sell some of it and buy in dips. Personally, I always sell my coins because I have a offline business and I uses my bitcoin earning for more additional cashflow. But I only sell at a premium price though. I'm not selling in dips and don't do panic selling as well.