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I don't think jackpots are needed to be earned in order to be a winner. It's enough to get a little profit off your initial deposit.
Greediness is really a problem when you gamble, urging to win will not increase your chance of winning. Sometimes you just need to relax and calm in order for you to think properly and have a good decision making. Being greedy is not a key for a successful gambling but patience and strategy, it is the essential thing to practice and master in playing gambling.
Also acceptance after a loss is essential so that you prevent being stressed while doing other activities. Learn to move on because you have a lot of chance to gamble again, but as what I've said, urging to win will make you gamble always. Accepting the reality will bring inner peace to you and it will not affect your environment.
Jackpot shouldn't be the focus because the probability of winning that jackpot is really low, focus on winning in other gambling games that is comfortable for you and you are confident with. Never try to bet if you play a certain game for the first time. Manipulate your emotion and funds to prevent huge losses.