My worst mistake in gambling is the usual losing all the winnings.
Since I get the winnings, I feel lucky without realizing that is the start of temptation. In the end, I ended up losing all my winnings plus my capital. Regret is part of gambling life.
That's why we should stop if we win. Gambling is a risky game, risky to lose our money. Winning from gambling is a fortune, and luck rarely comes. So do not force your luck, remember when to gamble and when to stop.
I think most of us will not stop when we win, we will think today we are very lucky, we can earn more and we keep playing until we realize we lost all the money, believe me, while you gamble and win, your greed will be stronger, then it makes you lose control and forget the rules you set before. Actually, I feel at the very moment we start gambling for the first time, that is our worst mistake, without that mistake, we have a better life than our present life