Hi ​@Nastya Boyko,

It sounds like you've accidentally deleted a team and are now unable to access the files within it.

When you delete a team in Figma, you'll receive an email confirmation. This email contains a link that allows you to restore the team,  along with all your files and projects within it.

So, your first step is to check your inbox (and maybe your spam folder, just in case!) for that email and give restoring your team a try. 

However, please note that the team owner has a 28-day window from the time of deletion to restore the team. After that, unfortunately, the files and projects get permanently removed.

For more details, here's a helpful guide from our Help Center : Restore a deleted team

Thanks,