Strength includes knowing when output has started becoming damage.

Part of being capable is recognising the point where continuing starts subtracting. Past that line, work has to be redone, relationships take damage, errors get made that cost more than the output was worth. Pushing through is a genuine strength and so is knowing when it has stopped applying.

Learn your own marker. Sloppy work, short answers, a mistake you would not normally make. Treat it as the end of the session rather than something to power through.