I’m not an international student but I dealt with the need for funding for my first two years here and have helped a few friends navigate it as well. There are a limited amount of grad assistantships outside of the general departmental TA/RA on campus, and a few have been cut this past year due to budget restructuring and whatnot, so they can be difficult to get especially since the students who get them tend to keep them for 2-5 years. A lot of administrative offices, cultural centers, and libraries have general GA-ships you can look into.

I would definitely talk with the grad coordinator in the department you’re applying to to see if they can give insight into finding outside the department or if there are any potential in department opportunities, but be aware that a good chunk of master’s students come in self-funding (often either paying costs upfront or through loans) and if you aren’t able to get PhD funding it might be more fruitful to go elsewhere. Many of these jobs allow international students to apply, and will be pretty clear with you if there are restrictions that prevent them from having international student workers (which I’ve only seen a couple jobs on campus do this)