I never did any gambling rituals and most likely will not start one also. However, if I get lucky on a casino, a certain in house game or slot, I will always be tempted to go back to do exactly the same (same bet size, same strategy, ...).
The word ritual has actually been attributed to something negative, which is why a lot of people will decline or refuse accepting the fact that they have a kind of ritual they indulge in before gambling. If, after winning, you go back to recall all the things you did before you placed the winning bet and then subsequently try to repeat the same process, that is already a ritual even without you accepting it.