No gambler can win in the long term, friend, because victory can be obtained when luck is on your side, while luck cannot be obtained every time.
Maybe playing with limits and self-control can minimize the number of losses when no luck comes, but many people out there prefer to chase luck rather than waiting for the right time to get lucky.

Basically, strategy is just a small way to win but you are still at risk of losing, so no strategy is successful without the support of luck.