Volume alone does not do it. What the process of starting to hear actually needs.
Leave sounds you cannot parse playing for long enough and your brain files them as background noise. Skill comes from how much you understood, not how long you were exposed. Thirty focused minutes beats three passive hours by a wide margin.
Material you understand around 70โ80% of improves you fastest. Too easy and there is nothing new; too hard and nothing lands because you cannot follow it. If more than two or three words per sentence are unknown, find something else.
Watching with subtitles on trains reading, not listening. Turning them off from the start leaves you understanding nothing. Listening once without, checking with subtitles on the second pass, then listening once more without keeps both.
It feels like native speakers are too quick, but the real obstacle is usually linking between words. You know each word individually, yet strung together they make a different sound. Replaying short segments, checking the missed part with subtitles, then listening again makes those patterns familiar.
Repeating what you hear aloud sharpens your ability to distinguish those sounds. Shadowing whole sentences helps listening as much as pronunciation. With no separate time available, repeating even one or two sentences from what you were listening to makes a difference.
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