I am not sure that there are any universities in the US that would be considered a safety for an international student needing significant amounts of financial aid. That being said:
The first thing that pops into my mind is wondering how competitive you are for volleyball. Stanford for example meets full need for all admitted students, has athletic scholarships, and has a very wide range of varsity sporting teams. Their athletic teams are looking for the student who is both academically excellent and a strong athlete. As one example, the year that I got my master’s degree there it was rumored that the quarterback was also a near straight A student. Even if you are not recruited for volleyball, Stanford might still be worth an application, although it would be a reach. I am similarly thinking that Harvard may be worth an application. Harvard does not have athletic scholarships, but it does have multiple very good sports teams (surprisingly good for a school with no sports scholarships), does have a woman’s varsity volleyball team, and does meet full need for international students.
ECs do not need to be associated with your high school. Your listed ECs are very good.
In terms of safeties and matches, I am really hard pressed to know what to say. A safety for admissions would be easy to suggest, but a safety for both admissions and affordability is another issue. Hopefully others can make suggestions.