Initially, you need to think not about how much you can lose, but how much you can earn, this is a psychological moment that already shows the player where he needs to strive. Although I agree that most players will lose more than they win, and for such, of course, limits need to be set so that they do not lose more, than they can afford, so that this is within reason.
The main priority that needs to be considered is both sides. When I said both sides, I meant either you want to earn or you lose, because when you emphasise what you will earn, you will end up losing. Although we all know that you most likely believe that you will definitely lose. As a gambler, you have to be someone who always sees the future, which might be good or bad. That is just what will sustain you and not end up exceeding your budget. Because when you focus on the profit you earn, you will end up taking a risk that might result in your life, so mostly you should emphasise both factors, which is either you lose or gain. Just not to a someone that will end up regretting his actions after the game is over or whenyour money has finished.