When I was in my MBA program, I often learned more about business from business owners (and running one myself) than the instructor. Usually, the people out in the field have a different perspective than those who are teaching. With the music industry, you have experts who come at it from many different angles: managers, lawyers, record labels, promoters, booking agents, publicists, journalists, solo artists, bands, studio musicians/session players, academics, consultants, and more. One of my favorite ways of learning is to study how other people are approaching their music career. Another is to look completely outside of the music industry itself.
When I want to improve on something specific, I often see what other successful artists are doing. This can be anything from a website layout, social media posts, biographies, and press kits to music videos, color palettes, song formats, and live performances. I often keep a portfolio of these artists’ work to monitor trends, key words, and imagery. It’s like having a list of reference songs in the studio when recording and mixing: the collection becomes a good point of reference to compare against.