As i know gambling is all about luck and how to control my greed, except sportbetting (of course need skill and strategy).

I have experience in gambling (casino), somtime i hit big only with faucet or free money and i can withdraw from that. but because my greed i always want more and more, then i'll come again with my money as bankroll. Bet more and hope win more, but because of that i'll lose my money little by little and usually i'll stop after my bankroll to be "0". I call that with greed.
Anyone here have any suggestion to control my greed? Let me know.