I don't encourage people to gamble since my parents raised me to be that kind of person. If someone asks for a suggestion about what should they do after suffering from a big loss I would just tell them that don't ever gamble again. They can't accept their loss despite knowing that they have a higher probability of not winning and they can't afford to lose in it so better keep their distance on gambling. They should take responsibility for it since it is their decision.
They should've asked themselves first if the people are willing to help if ever they'll be on a huge loss or if there will be a stranger that's going to lend them a hand after the decision they've made that turned out to be a failure.