[mtwshngtn]

Play very slowly through the piece at least a couple times every time you practice. So slowly that it's hard to discern what piece is being played.

Repeat the same process when you have your piece memorized. Then play your piece from memory but hands alone. You will build up the muscle memory required to keep the piece in your fingers, rather than your head.

[khazhoux]

No, I did that already. I practice slow and methodically. I keep a measure-by-measure logbook of progress. Muscle memory established. I can then play expressively from memory.

But eventually I'll move on to the next piece, and wind up forgetting to re-visit the other one for a few weeks or months. Gone!!

[chillacy]

> and wind up forgetting to re-visit the other one for a few weeks or months

Maybe adapt your practice to the forgetting curve, revisit a piece the next day, then in 3 days, then in 7 days, then in 2 weeks, then 1 month, then 3 months, etc. If ever you mess up the piece, then it's back to 1 day.

[khazhoux]

This makes sense. Thanks!