It needs awareness from the addicted person to gambling that they have a big problem that they must solve. They must listen to their closest people around them so they can see what already happened to them and try to figure out what they can do to solve the problem. When they don't realize about their gambling addiction, they will difficult to stop from gambling instead will still gambling and use more money.
They can not feel confidence with their strategy to win the game because the chance still 50:50 and the percentage will go up and down as the match running. But they must realize that trying more strategies can make them using more money which can lead them to losing that money.
It is possible that people around him will warn him not to gamble excessively, but it is not once or twice that I have warned my addicted brother to reduce his gambling activities, but the advice I gave him only went in through the right ear and out the left ear, so he clearly ignored the advice, even the advice from his parents was equally ignored, if they really want to stop, I think the key is in themselves, they must be aware of themselves and have the pressure to recover, because if they are aware of themselves, they don't need help or encouragement from other people, they can do it.
Actually, I think there will be no accurate strategy that can make the chances of winning bigger, however the bookie will have a bigger chance of winning and it seems like this cannot be changed.