Hello @Paweł Baranowski
Welcome to the Atlassian community.
When did you receive the notification of deactivation? Did the message include a reason for deactivation?
Atlassian reserves the right to deactivate Free subscriptions due to inactivity. Typically the inactivity period is 120 consecutive days of not accessing the instance.
As an instance approaches that limit email messages will be set to the Organization Admin and Site Admins warning them of the lack of activity and potential for deactivation.
An email will also be sent to the same individuals when the subscription is actually deactivated.
If you are the Organization and/or Site Admin you should've received those emails. Check your spam/junk email folders.
After deactivation there is a short window of opportunity to reactivate the subscription. If you are within that window you should be able to follow the guidance here to reactivate your subscription:
https://support.atlassian.com/subscriptions-and-billing/docs/reactivate-a-subscription/
If that window has expired then your data would've been deleted and would no longer be recoverable.
The above all applies if your subscription was free and deactivated due to inactivity. If the subscription got updated to Standard or Premium and was deactivated due to a failure in the payment process, that also should've generated emails to the individual(s) listed as Billing Contact/Billing Admin.
As a user community we can't do anything directly to help you. But you could reach out to Atlassian Licensing/Billing/Purchasing support to get additional support. Complete the form at this site:
https://www.atlassian.com/company/contact/purchasing-licensing#/
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