My best gambling strategy is by only playing roulette at the casino. Then I only play on colors I know that that is what beginners do but it has shown me to be the most effective.
So I suggest that you try it out, you will have to play many rounds but in the end it is worth it.
Ive doin roulette also, playing odd and even number, i get a little profit, just sticking my plan when to stop and when to cut my losses.
If you really need to win in Gambling, make a simple rule. First make your target of how much you plan to win and once to win that much amount , quit the gambling for that day and then come again to play gambling with new targets. This way your chances of earning with gambling will be more.