Improving your speaking style in English can be a big challenge. While there are rules that can guide you, the art of subtly varying your stress, pitch, and rhythm isn't an exact science. Native speakers generally have their own unique ways of speaking depending on how they were brought up, who they interacted with in their formative years, and what contexts they found themselves in. However, native and non-native speakers alike can improve their speaking style with practice. And italki is a great place to do that.