I do get what you mean with the gameplay part but I think most of it will be easier when we get another girl unlocked, this way we will be able to juggle more rather than just grind, part of the impatience that comes along now is probably due to the fact that we play update to update unlike a polished and finished producted so we become more susceptible to the flaw since we pass more time on the game... But it's true that the money and scene grinding can become quite repetitive after some time, perhaps adding a stock option to get some money regularly on the menu phone or anything else that help making it a bit less grindy
stock market just render the grind useless and remove the gameplay element, i wouldn't say it's the solution.
just make the gameplay more interesting, show interactions between customers and girls, like when the girls use the flirt skill and their sitting position changes, it's a small thing, but it is a step in the right direction.And i'm talking about animations, not just kiss.pnj, dynamics thing that reflect what is happening.
VIP room needs a reason to be here aswell. it's been here for ages but still serves no real purpose beside being there.
perhaps also add daily/weekly goals to achieve to obtain a small modifier on the cash at the end of the day.
ex: have 7 customer leave the cafe with a positive mood can give a 10% increase in total earning at the end of the day.
