[almstimplmntd]

As a (jazz) piano student myself, I am happy to see "To Master a Skill, Master Something Harder."

Pianist and YouTuber Nahre Sol has a great set of exercises based on modifying passages of Chopin etudes, which serve as excellent material to study both as a template and in their own right. [1][2] She varies harmony and rhythm, and takes the exercise through all 12-keys. Much harder than just learning the passage in the original key, but that's the whole point.

[1] https://www.youtube.com/watch?v=2xYfgJVm1Ns [2] https://flatfiv.com/products/piano-technique-intensive