Brainstorming time:
How many languages do you speak? How about teaching that language? Or yours to foreigners.
Have you considered doing translations?
Similarly, you could transcribe audio files for people. Some courses require students to record an interview with someone and later transcribe that, and some people either don't have the time or the patience for that, so they hire someone else to do it.
If you're good with statistics, you could offer that service for postgraduate students whose researches involve numbers.
You could take empty bottles/cans/plastic containers, or even used paper, to a recycling station and get a buck from it.
There's dog walking.
House sitting (as in someone goes to travel and you stay at their home for a few hours a day so people won't think it's empty and attempt to rob it since there's a smaller chance of getting caught) is a thing I learned about recently.
If you are good with tools or general handy work around the house you could offer those services.
Matter of fact, there's a thread I saw on Reddit with a bunch of ideas about that.
Here it is. Of course, it's easy to write down a bunch of stuff in a thread, but going after it involves... well, going after it, and depending on your characteristics some jobs might be dangerous or just not be a viable option, but still, think about what you
can do and how you could go about making money out of it, even if it`s just a temporary thing.
I hope this helps somehow, even if it's to just give you a spark of inspiration. Best of luck to you!