In a box of used magic I found an almost 30 year old letter from an established professional magician to a newer magician. It’s notes on the newer magician’s show, you can read them below:

The notes are pretty spot on, and great advice. I love that the older magician took the time to write up the advice so that it’s easier for the newer magician to implement the suggestions!
Personally I love helping magicians be better, and I think it’s something we all should do!
-Louie