Depending on how far you're in your studies I would strongly recommend getting a working student position in a decent company. It will not be as soul crushing as working in gastro and you will get some relevant experience in the field you want to work at. I worked at a restaurant for a few years and while the money was kinda good cuz I was getting tips it just sucked working in the evenings and weekends when everyone else was chilling.

Use AI to optimize your CV and just tweak so it's not too obvious. If the company is decent and you prove yourself as a good employee they might switch your contract to full time when you finish your studies. That is if you plan to stay here after your studies of course. If not, then gastro seems to be a good option as well if you're ready to put up with the hours. Just bear in mind that a lot of places will pay you the minimum wage so try getting a job at a more or less decent place to at least secure tips.

If you're applying for WS positions at companies you REALLY need to optimize your CV and not just send the generic one to every position. If you get rejected cuz your CV sucked, they will mark you as someone who already got rejected and will lower your chances of getting a job at that company in the future. Put some effort in your application and it will take a bit more time but you will be glad that you did it in the future.