One of the solutions which is recommended by most gamblers on this forum for gambling addiction is "Therapy" .
This is the most expensive solution for gambling addiction but also the most effective at the same time. Therapy is quite expensive especially if you are from country like US. Maybe this kind of service is cheap in 3rd world country if you will compared it to US rate but it’s still expensive in contrary if you will just control yourself. Don’t pay internet connection for example or have your wife monitor you so that you will not gamble.
I’m expecting this kind of suggestion here when I read the title but the content shows the most expensive method but the best in my opinion if money is not a problem.
My friend has spent a lot of money on therapy but it hasn't made any changes to his gambling habits. I think it's true what you said, at least using a cheaper method involving the family would be better in my opinion, for example, just reduce it slowly and increase other activities. something more positive, for example exercising or doing other things, I'm sure this method can reduce it even if it doesn't stop completely.
It is not easy to cure gambling addiction and it takes time to cure it, another friend of mine managed to cure himself by reducing his gambling and also involving his friends and even his family. Finally he managed to stop gambling completely and never even tried to gamble in a gambling house. I think it's a time-consuming process but in my opinion it's better than paying.

If he keeps playing and gambling well, no matter how much your therapy costs, there won't be any improvement, and your friend was merely wasting his money. Also, there's a chance that we will become bored during therapy sessions or that we will have to wait on other patients. While you're waiting, you might be thinking to yourself, "What if I get to play for a while? I won't be noticed anyway." After all, gambling can be done both in person and online. Thus, no matter how much the therapist suggests, you will never be able to put it into practice.
The majority of the cases of gambling addiction that I have observed in my nation have involved individuals who were able to overcome their addiction with the support of their families. When it comes to family, they are the ones who will make you feel guilty, and, therefore, you will be worried that they may abandon you. Indeed, I've seen it as a successful strategy to break their gambling habit, and I understand that their family is threatening them in that way.