I have an idea for you, it's not mine, I discovered it a month ago, it has supercharged my study.https://kantsmusictuition.blogspot.com/2007/09/secret-on-how-to-practice.htmlOn reading, this method made sense to me so I started/resurected a piece (Rachmaninoff's 3rd) and started a practice journal. I am now a fan of Mr. Kant and enthusiastically recommend his method.