Manage a bankroll.
Like in poker, in slots you have to handle the money properly. You should have your own bankroll management, which will allow you to put a certain balance into the game. It must be determined in advance, regardless of the result of the game, because any winnings, like loss, can intoxicate the mind and then, in a joyful euphoria or with the desire to play back can lose everything.
Golden rule: determine your budget for the game (or for the day), and under no circumstances do not go beyond it. Indicate how much money you are willing to lose and how much you can win, after which you can finish the game on that day.
When you are lucky enough to stop hard. Just like when you lose money. If you lose to the line marked - leave the casino, rest, distraction. Do not sit down to play back. Yes, sometimes you can do it, but in the long run, "it's not worth it."