Practise without your instrument
Similar to number 4, more and more evidence supports the effectiveness of mental practice. Especially effective when you’re unable to access your instrument or need a physical break, try mentally practising by closing your eyes and in detail imagining playing your piece, note by note, phrase by phrase. Try repeating tricky passages, slow them down and really imagine the experience of performing the piece. One piano teacher I know suggested playing pieces on the piano lid, or on a coffee table to sharpen up mental focus. Some professional musicians can even learn entire pieces away from their instrument. Practise on your daily commute or in a quiet space of time in your day, you’ll see improvement!