The luck in gamble shows only when the person starts gambling and not before that. Even so it is not possible for anyone to foresee when their luck will come to them. Luck simply comes and goes, it is momentary and hence not permanent. That is why gambling more only leads to losses because you may not be lucky every time and each time you play the odds are against you and the house edge draws money away from you.
If you want to see if you are lucky or not, not only from gambling. See if you are lucky enough in your real life or not. If you are lucky in your real life then you are lucky although you keep losing gambling. I am the guy that will never win in the long term or short term so no matter what for me itis not profitable