Well, when do you sell the whole volume, when will the price increase by 500%? Well, then this long wait.
You may not know when the coin has actually gotten to the peak, the best strategy at this point is to sell gradually to the top, here it means one can sell every 20% of one's holdings as the price pumps
Selling coins depend upon your number of coins that will make your decision only of you are in profit. Let's suppose the price of Bitcoin has increased and you are in profit then you should not proceed for selling all the holding coins because the value may increase more so you will have nothing for selling then if you sell all coins from now. Better you keep some for more higher selling which will give you excellent returns.