Keep a shinobue practice journal!
Keep a practice journal.
I play multiple instruments. Whenever I learn a new instrument, I create a practice journal.
When I'm practicing, I write down what worked.
Then, the next time I practice again, I review the notes and build upon that success.
This small habit has always helped me to learn a new instrument rapidly.
You can just download a simple note app or do it the old-fashioned way with a notebook and pens.
You will be surprised how effective it is!!