Congratulations on your acceptance!
As others have said, contact the financial aid office at NYU ASAP. You may not hear back until after the new year, since it sounds like administrative offices are closed until January 3, but it cannot hurt to reach out and leave a message, and then follow up first thing January 3 if you do not hear back before then.
https://www.nyu.edu/students/student-information-and-resources/winter-break-guide.html