“My Profile” reflects you as a Creator; it is where all your posts, products, and cumulative impact are showcased.
“My Brand” is set up within your Creator account. It is where you house all your designs! You can create “Collections” - think of these as drops or products from the same family, and name them after various themes, seasons, etc. - and within each Collection, you can create different “Products.”
You have full autonomy over your brand identity - it’s your blank canvas to fill!