First and last, vocabulary.
The words and phase you can use will determine the level of your English, usually the minimum level, and you must always pay attention to your vocabulary building.
Reading articles, listening to audio, watching video clips on YouTube etc., all service one and the only purpose at the very beginning: to expand your English vocabulary and get familiar with those words.
All other shortcuts, advanced learning skills all have one hidden prerequisite that is you have already mastered enough words and phrases. If there are too many words and phrases you cannot understand when you are reading an article or watching a video, and you have to look them up in a dictionary, it will be cumbersome, and frustrating.
Language learning is always a spiral, it is hard and there is no effortless way. The more words you know, the more confidence you will have, and during the process, your English skill will be more proficient.
Do not overlook the effects of writing. Try to draft an article with the words you already knew and then try to polish this article with unfamiliar words with the same meaning, fell the differences of these words, your skill will be taken to a whole new level.
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