I apologize for trying to impose my opinion on you, but I think that you are making a mistake by selling BTW for such a ridiculous amount, because it will cost much more. Although there may be different things in life. Therefore, of course you decide.
You don't need to advise him. Anybody is free to do what he so wishes to do so far he is ready to live with the outcome and not wine about how someone tricked him into taking such decision if it happen that BTW didn't worth the intended amount after all. When BCH came I waited a while before selling and after some weeks, it started to increase but I was not bother simply because I sold in my own volition and nothing else.