Most of people they are a master in their respective field and that's enough but is it truly enough?
From my experience, it is not.
Here is the proof
You maybe the best manufacturer of denim but no one knows and your sales are local and you barely meet ends, whereas the guy next door does an average quality of denim but the sales are decent to make a profit to sustain the business for the long term
Wondering what he is doing that you're not?
Do you advertise what you do? If not start now and feel the difference in your bottom line