Last 4 digits of my SSN leaked but I’m abroad, what should I do?

Context: I was an international student in the USA on the F-1 visa and I’ve left the country. However, I am still using my American bank since I’m still fighting with my ex-landlord over my security deposit and will potentially sue. Recently the last 4 digits of my SSN was leaked to someone potentially hostile to me. Nothing’s happened yet but is there a way to protect myself, especially if I am abroad?