ay, nice game idea, here are some ideas that COULD be good, (if they arent in your game already)
more shops and services - how about a mechanic shop where players fix wrecked cars and a clothing store to customize their look, or maybe a gas station to refuel?
job tiers and progression - what if jobs have levels? start as a trainee cashier learning to work, then work your way up to a manager with more responsibility, aswell as getting more cash or whatever your game currency is
since your game revolves around driving, heres some ideas to make that part better -
different car types - not everyone wants a sports car or an average family car, add more van types for delivery drivers, funky convertibles, or monster trucks for off-road racing.
customization options - let players paint their cars, add spoilers or rims
you could also create some challenges -
delivery time trials - drive pizzas faster than a set limit
cashier accuracy tests - see how many customers you can serve without messing up their orders
car races or obstacle courses - allow others to put their modified cars to the race
tbh, some could be too advanced, but these are just some simple ideas i could give you.
It’s actually a great idea, I also planned to add a Gas station in games, but in customization for the cars might be a complicated function currently, but I’ll take to try this.