Winning in a casino is a random event, you dont know what time you will get lucky if you go and bet. Meaning there is no particular casino we can boast about winning more often from. However, in terms of sports betting, we can prefer one platform to another because of the huge odds they offer and most importantly the bonuses. If there were any casino that we get lucky more, people wont care trying new casinos until they day there luck shines less.
If maybe OP's luck shines better in new casino, then it's just a coincidence, if that's really a fact, many gamblers would have had same experience but I guess that that's how his luck locates him and as we said that luck is random, no one knows for sure when he or she is going to be lucky. It just take the right timing to win and no body knows when it's even the right time.
You are right, lucky happens randomly. And if someone is fortunate enough to get lucky regularly in one particular casino then his experience is unique. That shouldn't mean if he gamblers more often his win is guaranteed.
It is interesting to see how luck happens to everyone differently. So yeah, it shouldn't get into OP's head because there is no certainty he will win more.