A person who has achieved mastery in a particular matter becomes an expert or opens his business. Usually this adds worries and risks, but you can earn considerably more by buying other people's labor or providing unique services. Your knowledge and skills will always give you the opportunity to earn extra coins - take care of your Business and it will pay you back. The founding of the Principality and caring for its residents, the construction of a city or a settlement, the opening of jewelry production - the choice is yours. And, maybe you want to do farming and livestock farming? Or do you want not only to collect and sell crops and livestock products or produce ammunition, but to build your own ship and go to distant lands?
Try yourself in any business you like!