HI @Yuliya Skorobogata ,
You could either delete your Microsoft Teams free edition:
Delete your Teams free organization
https://support.microsoft.com/en-us/office/delete-your-teams-free-organization-2c28cfcf-3fbf-497c-938f-8815a8f6a6b9
Or you could consider upgrading your Microsoft Teams free edition to a subscription based Teams.
Upgrade Microsoft Teams free to subscription version
https://learn.microsoft.com/en-us/microsoftteams/upgrade-freemium
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Best regards,
Leon