For starters:
1.Cook lot of Burgers- only 5 mins cook time and sell for 4 coins each fast money
2.Many tables posibly the cheaper 500 each -work with space so ur waiter can walk and access tables conveniently.
3.Many Doors possible 3-4 for more costumers can enter and exit.
4.Dont buy too many counters you dont need it limit to 2-3 is a good chance of fast food deliver.
5.Dont cook many different types, at the same time so you can lessen your counter demand.
For Advanced:
1.Cook the latest menu possible with many serves at a time.
2.10 tables is the appropriate number to maintain a 105 rating
3.Remove drag your door to your inventory when you don't have any dishes to serve to avoid rating drop down.
4.Block your waiter started from your counter to fasten dish served and plate cleaning.. just see my cafe.
5.Smile and greet .. joke^__^V
For Expert:
1.Use Cheat Engine 5.5 and Hack your self!
gudluck!