Papa Louie Games Tips and Tricks – Anyone with any tips to share?

Hi everyone,
Has anyone played the papa louie games? This is a very interesting restaurant management game series where you have to run restaurants such as pizzerias, sandwich shops, or ice cream shops. I just tried it and found the gameplay very engaging, having to cook dishes while managing time to serve customers. Does anyone have any tips to help upgrade the restaurant quickly or serve customers effectively? I look forward to receiving your experiences!

Thanks!