What works one day might fail the next. When it comes to gambling, there is no strategy that can produce consistent results. It's all about chance, not skill or strategy. Sure you can try tactics like managing your bank, picking games where the odds ain't stacked so high maybe even throwing a few basic plays out there. But ultimately the outcome is always in the hands of luck, not some can't-miss strategy.
You're right, it's sometimes happened to me that when I play according to my own strategy, or something natural let's say instinctively, things don't work out for me because when we play the same, it becomes a pattern where the casino reads it and doesn't. It allows us to win more, however with the strategies we play differently and it may be that the probabilities of winning increase, because we are not playing under a scheme, of course, it is not about making 1 or 2 strategies, the idea is to know as many strategies as possible possible to apply them at all times to see what gives results, there is no single strategy, luck is a great factor, but I would say that the house advantage is the strongest factor that prevents us from winning and restricts our luck, then strategies are created based on that.