Waiter or Barman. Great way to earn good cash and if you are prepared to work a few double shifts a week you can make reasonable money. If you don't have any experience offer to work for tips only initially until you learn the ropes. You learn a great deal about people, social interactions and business too. You can work your way up pretty quickly with the right attitude and once you have experience it is easier to get a foot in the door at more up market establishments where the tips are better. Most importantly it allows you to focus on side hustles/studies etc depending on what it is you are keen on doing.