You shouldn't invest all your winnings at once, you should take 50 percent, and with rest you should gamble
Why not? Maybe you should give some argument why he should invest only 50% and gamble with rest of money?
Whenever I win in gambling I withdraw my profits and either I spend them on my luxuries or else I invest them in different altcoins from where I can make regular profits at regular intervals keeping my initial capital intact for gambling.
It sounds like you are winning all the time which is very hard to believe. What do you do when you lose?