If it’s really important to you and you can afford it - once you have some basic understanding and vocabulary - go live for 3 months in an English speaking coun

If it’s really important to you and you can afford it - once you have some basic understanding and vocabulary - go live for 3 months in an English speaking country (or whatever language you’re trying to learn). It may seem radical but as far as I know it’s by far the fastest way to learn. 3 months seem like a lot, but I believe you can reach the level that would take several years of learning with usual methods.