Gladly, I overcome already this weakness through securing immediately my profit by withdrawing it and convert to fiat via exchange P2P to avoid gambling again for more win.
I think withdrawal is the best option in this case as well. Most of gamblers fall into greediness because of the sweetness of winning and the longer we keep risking the harder we get satisfied, we may think that we can win more but losses are inevitable in gambling and it is a general fact. So the best way to avoid that is withdrawing your wins before losing them in stupid impulsive bets, then living in that circle or depositing and losing everything.
In my opinion, in order to gamble right you need to learn how to manage your money as well as managing your own actions and controlling your feelings and desires. Knowing that gambling might cause you to be broke will forbid you to do impulsive actions.