The metronome doesn’t care how you feel. That’s exactly why practicing with it makes you better.

Your sense of time bends to match your mood, speeding up when you are nervous and dragging when you are bored. You cannot hear yourself doing it, which is the problem. Something external and indifferent gives you a fixed line to measure against, and the places where you drift become obvious instead of invisible.

Put the click on for ten minutes of your practice, slower than feels right. Play a passage you think you already have and watch where you rush, which is usually just before the hard part. Spend the rest of the week on only that spot.