What the Previous Failure Actually Taught You
The stalled attempt was not wasted. It was a data collection exercise — you just never got round to reading the results.

The audit, not the autopsy
Most people treat a previous failure at learning something as a sealed chapter — embarrassing enough to avoid looking at directly, and certainly not something to analyse in any detail. That instinct is understandable, but it leaves useful information on the table.
Before you start again, it is worth treating the last attempt not as a verdict on your ability but as a rough field trial. Something ran for a while, then stopped. That sequence contains more usable signal than any amount of planning forward from scratch.
The first question to ask is not "why did I fail?" — that framing pulls you toward character explanations, the kind that end in not disciplined enough or left it too late in life. The more productive question is: what exactly stopped? Not the general narrative, but the specific mechanism. Did you run out of time because of something that has since changed, or something structural that will be there again? Did you hit a difficulty spike that turned out to be genuinely hard rather than a sign you were wrong to try? Did the method bore you into abandonment, or did life simply collapse that particular hour in the week?
These have different answers, and the answers point in different directions.
What the gap tells you
A previous attempt also shows you how far you got before momentum failed. That is not nothing. If you reached intermediate grammar in a language, basic chord transitions on an instrument, or the third chapter of a difficult text before stopping, you carry more than you think — and much of it returns faster than it was first acquired. That is not consolation; it is a documented feature of how memory works. Relearning is genuinely quicker than learning from nothing, even when it does not feel that way at the start.
But the location of the stall is informative in another way. It tells you where the real resistance lives. For many adults returning to something, the stall point is not random — it tends to coincide with the moment a subject stopped feeling approachable and started feeling genuinely difficult. The beginner's structure runs out. You are expected to tolerate more ambiguity, work harder for smaller gains, and push through what looks — from the inside — like standing still. If that is where you stopped last time, you are not bad at the subject. You are normal, and you stopped at a very common place.
Knowing this means you can prepare for it, rather than being surprised by it again. The plateau the previous attempt stumbled on is probably still there. This time, you can arrive at it with lower expectations and higher tolerance — which is almost entirely what is needed to get through it.
Reading the real lesson
The most honest audit of a past failure asks one further question: was the goal actually yours? Adults returning to a subject often discover, on inspection, that the original attempt was partly driven by a version of the goal that was external — status, a sense of what a person like them should be able to do, someone else's project that they joined. That motivation erodes reliably, because it was borrowed in the first place. If the new attempt has the same engine, it will stall in roughly the same place.
None of this requires much ceremony. A few minutes with a notebook and some honest questions is enough. What did you try? Where did it run out? What made that week impossible — and is that reason still in place? What would you do differently with the method?
The answers are specific to you, and they are more useful than any general advice about how to learn, because they are drawn from the one experiment that actually involves you, running under your actual conditions, with your actual life in the way.
That experiment already happened. You might as well read it.