Hey there! Celine from the Community Support team at Figma here. I don’t speak Korean, hope it’s ok I continue in English here!
From what I understand, since you’re still currently enrolled, the first thing to check is whether your Education status needs to be reverified.
Education status is valid for a set period (one year), and students may need to reverify once that period ends. If the status expires, an Education team can be downgraded to the Starter plan and, depending on the number of files, may appear locked as you encounter here.
I’d recommend to verify once again your Education status. If you are a higher student, please apply directly at figma.com/education/apply with your school-issued email address, select Higher ed for institution type and complete the SheerID verification process.
You can also find more information in our Help Center article: Figma for Education.
Please also note, if you’re a higher-education student and run into an issue during the SheerID verification process (or you’ve already been verified but your Education status still isn’t reflected in Figma), please contact Figma’s dedicated SheerID support team at figmasupport@sheerid.com. When reaching out, please include your school email and any screenshot of the issue you’re seeing. Thank you!