Hello @M_Bugrahan Ceran
Welcome to the Atlassian community.
When was the last time you were able to access it?
What happens now when you try to access it?
Do you have a Free subscription or a Paid subscription?
If you have a Free subscription have you accessed it sometime before this in the past 120 days? Free subscriptions that are not accessed for 120 days are deactivated, as documented here:
What happens to Free plan products if they're inactive for too long?
Inactive Free products will be deactivated
If your subscription has been deactivated, the data is retained for a short period of time after that so that you can re-activate the subscription. The time periods are explained here:
Data retention period
There is also a link there to information about how to reactivate a subscription that is still within the retention period.
If the retention period has expired, then your data is gone and cannot be recovered.
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