Theory says you should stop buying the crypto currencies whenever they start to rise because you dont know the end point for the same. End point? Well we dont know whether it will rise X2 X3 or something like that or whether it will surprisingly will start pulling itself back to lower prices at which you bought it. This can happen and have happened many times. So its better to stay back.
Im wondering where you was when the crypto currencies were kissing their asses at bottom prices.  Now is the time to stay away from buy button mate.