I also don't know what the definition of a professional player is, are they those who never stop playing? do they know when they will get lucky? (and honestly I'm not sure about that), or those who have continuous luck? also I'm not sure there are people who continuously get great luck.
If you don't gamble regularly, you probably don't know about these or have no idea. I don't think gambling is completely based on luck. Especially some card games and sports games. If you can apply your analysis correctly, your chances of winning increase a lot. But I won't completely deny luck, everything needs luck. Nothing really happens without luck, it's a set of rules that no one can break. There is someone sitting at the top to control luck, but if you can use your skills, maybe you can reduce the chances of relying on luck.