Hitting a plateau in Spanish? Traditional methods got you beat? Here is an honest accounting of the only obstacle left — and an argument for running straight at it.
Between you and C1 there is, honestly stated, one thing: your own boredom. Not access — the road is technically open, tonight, in your browser. Not variety — thousands of recorded sentences are all the variety your ear needs. Just boredom. Around week three you will start questioning whether it's worth it. That question deserves an answer prepared in advance.
People who fast will tell you the hunger is the point. Same here. The boredom is the consequence of your own goal — a problem you have with your own commitment — and you might as well confront it sooner rather than later, because it is coming either way. You are going to be bored in this life regardless; call it the modern condition. So you might as well get good at acting in spite of boredom: listening, transcribing, clicking next, with no desire to do so.
Boredom is a wrestling opponent of the old kind. Menelaus held Proteus while the god turned into a lion, a serpent, running water, a tree — and got his answer by not letting go. Jacob wrestled until daybreak and walked away with a blessing and a limp. Boredom transforms the same way — into your phone, into "research," into a better plan that starts tomorrow — and it yields to exactly one thing: a grip that outlasts the transformations. Get even more bored, and get good at laughing at the feeling.
Somewhere inside this process you acquire an intuition that transfers to everything else: the feel for when victory is simply more of the same — more reps, more cold calls, more sentences — rather than innovation, novelty, changing it up. The Soviet lifters just did more deadlifts. That is the entire secret, and almost nobody wants it.
Our sentences arrive out of context, and that too is a feature. Context accelerates reading — in a domain you know, it practically reads for you. For exactly that reason it is a crutch for listening: it inflates your apparent comprehension while leaving the underlying phonic weakness untouched. An ear that cannot hear certain sounds is like an eye that cannot see certain colors, and context lets you keep guessing the color from everything around it. Strip the context away and the brain has nothing to lean on. It must make sense of the sound itself — and it keeps trying to long after you stop. That is not a side effect. That is the mechanism.
Compared to becoming a millionaire, learning a language is a cheap and easy first success. Nobody becomes a millionaire without a success pattern — without dragging himself through boredom, like the salaried index-fund investor who forgoes the vacation through a bear market. Sports and music take far longer to reach excellence in. A language sits in the sweet spot — and its near-pointlessness, if you already speak English, the world's reserve language, is what makes it a clean test. What is under test is not the language. It is whether you follow through on a commitment you appointed yourself, however trivial, however absurd. Follow through on one, and every other one — money, health — gets easier to believe.
Here is what will actually happen to your dream: you will disown it. Today you don't really want to — yet yesterday you did. You wanted it this morning, over coffee, before work, before another day went wherever the days go. Left alone, a dream degrades into commands from a stranger — someone you come to resent for giving the orders. So get good at following orders from that particular stranger. He was you, at your most awake. You only get time back when you decide.
Tonight's brain is one day — and one night of sleep — younger than tomorrow's. The consolidation happens while you sleep; the schedule does the compounding. Why not go to bed tonight with ten Spanish sentences in your head?