Just wait for the winning time of your gambling session and after that winning time then its the time for you to run out of the site together with the money you are playing with or play with another site and aim for a specific amount of bitcoins.Because after that winning streaks in a site they will strike you back and take all your money,
Ya. Winning once is enought to leave the game. Because if you continue to go on you might lost your win and lost also your hard earned bitcoins. Better find other ways and means of earning with out much risk rather than gambling.
doing this would be the best way instead of proceeding and allow yourself to be engage with this gambling activity if you win good profits try to divert it to another way such as trading or any investment that will grow your hard earned btc its much lesser risk you just needed to study how the movement of such investment will work and you can learn to gain more.