If you are solo, any time you spend doing anything else than coding and improving product is a complete waste of time. A well done product will raise interest in a given market or segment. There’s a joke in there somewhere about a well done AI based product will literally market itself. Marketing is raising interest. Nothing more.
Marketing is the identification of customers with a need (a market), and all of the associated activities involved with making the solution (product) and getting it to those people in need for a price they can justify. It encompasses the entire company, which is a bit more than "raising interest."
