Basically, gambling depends on luck, but gambling strategies are also needed. That is the reason why some people work hard to learn strategies about gambling, which will increase the chances of winning.
In some games you do require strategy and experience as both counts. So here people need to work hard in order to get it polished and this can be added advantage to them against their competitors. So working on such would key for a good betting session for people.
Strategy, experience, nothing really counts except luck and if you are not lucky, there is actually nothing for you and the only way experience and strategy may come in, is to know that you need to always set a limit for yourself, either as a loser or as a winner. Hard work can apply to so many things, but not in gambling.
If you want to be hard working, go start a business, get a job or even start your own casino and work hard to make it a very sweet place for gamblers to come waste their money, because whether you like it or not, the only people making the best from gambling are the casino or platform owners and you are the one giving it to them.