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I agree with what @monique.klabis said! I am (relatively) young but I really can only play a handful of pieces fluently at a time. Improving sight reading, like Monique said, would really help with relearning. I have a couple repertoire pieces that I would play through a few times a week in order to keep them fresh. These tends to be easier pieces (compare to the ones I am currently learning) so I don’t have to spend a ton of time on them weekly.