A failed attempt is a spreadsheet full of useful numbers. Read it before you delete it.

An attempt that did not work still produced information you had no other way of getting. Where it broke, how long it took, what you had wrong at the start. That data exists only because you tried, and it fades fast, because the instinct after a loss is to put the whole thing out of sight.

Before you move on, write half a page while it is still clear. What you expected, what actually happened, and the point where the two separated. Read it before the next attempt. That is the difference between failing once and failing the same way repeatedly.