Now holding bitcoin is good, but having ethereum is also good going forward. I think maybe you can buy ethereum in half and leave the other half for bitcoin.
I think it's better if he must wait for the signal that will appear in the market before try to convert back his bitcoin into the ethereum. there are so many big news that can be used to bet on ethereum but the problem is he must not take the wrong position to be able get the profit from the bullish trend.