Hi there, Celine from the Community Support team at Figma here, happy to help!
As you have to cancel your Education plan, it will be downgrade your team to the free Starter plan.
 

‘What should I do so that I don’t lose my projects and files?’: If you want to continue using Figma on the free Starter team, here are a few things to keep in mind before you downgrade: 

• File limit: On the Starter plan, your team can have three FigJam files, three Figma Design files, and three Figma Slides files with a maximum of three pages per design file. You can invite as many people as you want to view or edit these files. If you have more than the allowed number of files in your team when you downgrade, Figma will prevent you from being able to edit your files. To keep editing those files, move them to another team or to your team drafts. 
  Learn more about moving files.
• Project limit: On a Starter plan, your team will have one project. If your team has more than one project when you downgrade, Figma will lock your team and prevent you from editing your files. To keep editing, you'll need to reorganize your files and projects so they are under those limits.
  Learn more about moving projects.

If you want to continue using Figma on the free Starter team, we recommend that you do the following:

• Move up to three Figma Design and three FigJam files into one project
• Remove extra projects
• Move files to another team or to your Starter team's drafts
• Download copies of your account invoices

Hope this helps!