Basically you know exactly whether it's time to sell or not. Because you know in a safe position by comparing it where you buy it, so that when you sell it you can get a higher price, right? if at this time it is above the BEP and you are afraid there will be a decrease again then sell it immediately, if not then keep it and if it will go down then sell before reaching your BEP, as simple as that. DWYOR, all of them can only give advice as far as speculation, so strengthen your mind for whatever decision you make.