You practice Listening and Speaking and you can develop Writing by yourself keeping a journal. Even more, attend a qualified school in the English native-language country you're living for a considerable period of time, for example a minimum of 3 months and a maximum of 6 months. To get a job in that country it's even more helpful.
There's nothing particularly special about the English language that would make it better in any sort of way, especially in affecting living standards. Language is just a means of communicating. The coincidence that some of the more developed countries have English as a native language is quite arbitrary. Consistently the countries with the highest living standards are not English anyway, so statistically speaking, no, English countries aren't better to live in