How do you win in anything else? With trying I would say, and every next try should be better then previous one, to every new try you need to add more experience, more knowledge. Positive thinking is when you fail you find power and means to continue, to try again and again until you final succeed.
Who gamble a lot know that gambling is a series of winning and losing, how to avoid big loses in a game, and how to make money with winning streaks depends from many things, which game you chose, your bankroll, odds and bets. Books has been written about it, and there are many tutorial about it, but nothing beats practicing and trying.