Hi ​@mustapha_elaballaoui, thanks for reaching out! 
 

After canceling your Figma Professional plan, you will still be able to use all the Professional plan features until the end of your current billing period (before your typical renewal date).
 

To ensure that your access to your projects and/or files won’t be affected, keep in mind that your account will be downgraded to the free Starter Plan, which includes the following features:

• File Limit: Your team can have up to 3 FigJam files and 3 Figma Design files with a maximum of 3 pages per design file.
  • You can invite unlimited collaborators to view or edit these files. If you have more than the allowed number of files in your team when you downgrade, Figma will restrict your editing access. To keep editing those files, move the extra files to another team or to your team drafts. You can learn more in this guide about moving files.
• Project Limit: Your team will be limited to one project.
  • If your team has more than one project when you downgrade, Figma will lock the 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. You can learn more about moving projects and moving files.

Hope this helps clarify!

​Thank you so much for your answer ​@djv