Do not sell everything, sell only if its really needed, the long run is in the early stages, for now I think you should hold your coins, because there are signs of a new wave coming.
Yeah it is better if you are not going to sell everything you just need to be calm and be patient while waiting for the right and profitable way of selling your bitcoins. Holding is really going to be an effective way to get some profit with bitcoin so if you are going to sell your bitcoins today for sure you are going to regret the possible income that you may get in the future.
Selling coins will depend on its entry price, if a person has bought them at price level of $250 then he can afford to sell even at this stage as he has already made huge profits even at current price.