You never know maybe you win the first time but do not go overboard because there is no way back if you lost it all.
Lol what are you talking about not much to lose, that is 100k USD, meaning there is a big chance he loses 100k USD in gambling if he chases his losses. Anyway, there is no "safely" (without risk) when it comes to growing your money. Even farmers have to take a risk to grow their crops. It is the law of the universe; you need to take a risk for your finance to boom. Invest it in some long running profitable ventures; that will at least minimise the risk.