>>4898
>my asset for those positions being my mastery of the English language and that I present myself decently IRL. I applied for janitor, 'repositioning of goods', cashier and something else I can't remember at the supermarket
How assertive you appear when presenting yourself can be the deciding factor at these places. Think about what you wear, I don't know about your country but for jobs like grocery stores you can go where wearing cargo pants and a lumberjack's shirt along with sneakers to give an "active" impression, since it's that kind of job. The manager won't think you fit in if you're too "well" dressed. Personal motivation also matters, such as

"I love to meet people and to work manually, I've always liked working with my hands. This was why I choose to study to become a surgeon. I'm still aiming for that, but I want some experience from other jobs as well and now I need some extra money!"

https://climbtheladder.com/how-to-become-store-clerk/

Check this list here.

I don't have a site to recommend, but taking some basic course (can be just a 2 week course) in business or economy for stores, is a good idea. Then you mention that you did take such a course. There would also be similar courses for how to handle food (food safety) and how to do cleaning of facilities where food is handled.

Maybe you can try something equal to Subway, where you prepare fast food in the simplest manner (no cooking).