My strategy to gambling is to quit when I'm losing because I understand that there are no perfect strategy to winning in gambling. The owners of casinos and gambling sites are in for making profit and they won't expose themselves to losing either. So it is a game of luck and when luck run against you the best to do is wait for another day and by that way you are saving your money for a winning day.
That is probably the best gambling strategy as if you are losing then you may be overcome by emotions and make the wrong moves.
Many people try to chase the losses which is an even more bad habit in gambling. If you are losing in gambling, it's better to stop gambling for that day, do some other activity, and come back the next day to try your luck.