Hi Fareha, this is a pretty good question, and there are many different answers to it. I think it helps immerse yourself in English - listen to a Podcast several times per week (they offer great ones for free on BBC English for different levels), watch series in English (with subtitles if necessary), read a bit, and take lessons (where you speak a lot and build up your lexis) at least twice per week. Before and after the lessons I would revise (I make summaries, flashcards and kahoots with my students). That said, it comes down to the learner's needs and interests - some learners prefer to read and write, some like to have individual online lessons, some prefer to meet in person. It is important to find your way and have fun while learning, it is rewarding :) All the best from Switzerland!