It would be cool if there was a experience system for the player that affects how well the player can run certain business and it varies on a few things. players can level up ownership experience in specific types of stores like fast food, supermarket etc. and it could result in certain boosts to the business for example like cheaper prices for materials, increase in sales/ price elasticity, decrease/increase in certain attributes of the business and a slow trickle over time increase in marketing.
Players gain experience in multiple ways. Owning the business/ businesses gives you a small amount of experience as well as some more if you have a profit on the day. You can gain a EXP multiplier if you own specifically one type of Business. However the fastest way to gain experience is to actually work a job at a business of the specific business type. After you have gained some experience and levels in a specific business type, you can go through and getting certifications based on the business. getting the certifications can act as both a hard barrier to progress their level or a boost that allows the player to progress further or gain more buffs to the business.
It would also be cool if based on your business and experience you get some funny monikers like king of fast food. it would also be something cool to see with rivals having different monikers which would let you know what they are invested in.