To speak English like the real owners of the language. You have to stay around them.
You may learn how to speak English from an online class or offline class. But who do you practice with. There are many factors associated with the differences in English tone in countries.
The Food, social, lifestyle. They influence the type of English in that area. It is when you move closer to the natives and do what they do, eat what they eat. In years you observe you speak exactly like they do.