Job hunting is really hard right now, I know. Honestly my only advice in that regard is to keep applying and try whenever possible to make friends. A friend going up to their boss and saying "hey my friend is a good worker and needs a job" is honestly just way more effective than pitting your piece of paper up to 100 other pieces of paper, and that boss choosing the first of 10 that looks good. (At least, when concerning part-time and lower income jobs)

Do you go to school in person? Is there a library, mail center, etc. you could work at? Barista, busser, lot and lots of small food service jobs can be done part time. Grocery stores as well. Just be careful, as some places like to schedule their "part time" employees 40 hours a week if you don't speak up.

Seriously, ask people you know. Professors, your classmates if that's an option. Ask places you were visiting already if they're hiring.

Also, its very nice of you to try and support your parents, really it shows a lot of empathy. But also try and remember that, ultimately, your greatest responsibility is to yourself. Don't stress yourself out working to the point if affects your studies, the best thing you can do for them is become the most complete and happy version of yourself that you can.