Is not really luck because there are strategy that works for some people though may not work for others. Just try as much as you can to identify one strategy that will work for you and not to depend only on luck which in my opinion may not work for at all times because odd of the house are always against you.
Imo strategy to win a game doesn't exist on gambling. It's all about luck. Either you win or lose on that day. Strategy when to quit the game is the question for many gamblers. Most don't do this, they just gamble all of their money not think when to quit if they win some amounts or stop playing when they've already lose much.
With just few exceptions though.
But if you are playing like slots or betting on a lottery, then everything boils down as to how lucky you are going to be that day. That's why if you are not willing to lose many in many luck based games then stay away from it and learn games that you have a good chance of winning + your strategy.