This is wise advice.
Writing is about finding your voice. Some will like it, some won’t. Some will tell you how you should be doing it. The truth is, you decide how to develop your own style. No one can tell you how to be unique.
Actually, no one can actually teach you how to write. Sure, you’ve taken courses that tell you about grammar and proper punctuation, but the art of writing goes beyond that. All you need to do to become great at this craft is writing a lot and reading a lot. That’s all.
The occasional workshop can guide you, yes, but you gain real experience with your hands on the keyboard and with your eyes on a book.