From my experience only people who play for fun win occasionally.
Strategy? There is no guaranteed strategy to earn with gambling.
All strategies work until they don't.
Because the house always do adjustment every time they found a certain gambler or a system is working not in their favor, that is how wise they are as they are serious with their business, therefore for a gambler, we should follow the behavior of the owners towards gambling, we should also learn how to make adjustments.