I don't know if this will help, but here are some general tips for anyone struggling:
1. You don't need to serve every customer to completion. If you serve them to completion you get a tip of 25 but you don't really NEED the tip to complete the goal. Each plate served gives you 50 of the currency, use math to figure out which customers you should serve and ignore.
2. There's a catalog on the table in Rody's apartment. I clicked around so much and didn't see it. If you buy things from the catalogue you can make the game easier, although you might wanna save up for matches.
3. Make sure you're always pressing the WASD or arrow keys to interact with stuff. You can't just click Z you also need to be pressing up or whatever.
There might be more to say but that's just what I noticed! Hope this can help any struggling players.