In my opinion making cash from gambling is not a good option and the statistical probability that you will win every game at every casino is very low. I think winning or losing every game is completely in your head, so your individual tricks are not there. However, we all have some kind of luck so we should strive for what is possible for us.
It's not about luck, it's about mathematical statistics. You mentioned casinos in particular and that means the majority of the games you'll play are going to be weighted towards the house. Even things like blackjack give the casino an inbuilt advantage where you are more likely to go bust than the dealer - they have second mover advantage and unless you're card counting you'll never beat their strategy. If you include poker rooms, where you're feeding the casino take but (hopefully) taking winnings from other players, then you could possibly walk away with a profit without luck being involved.