Hello @Katharina Schöpf
Welcome to the Atlassian community.
As a user community, populated mostly by customers and vendors, we don't have access to the Atlassian infrastructure backend or anybody else's sites or billing information. So, we are not able to check why your site is unavailable. We might be able to offer you some advice, though, if you can provide some additional information.
Are you only an end user of that Confluence site, or are you the Confluence Application Admin, or are you an Organization Admin for the Organization under which the site exists?
When was the last time any user successfully access Confluence content on that site?
When did you first discover this problem, relative to when you created your post here?
If you are not an administrator for your Confluence application or Organization, have you reported this problem to those people? If you have not done that already, you should do that as soon as possible.
Do you know if this site is running a paid subscription for Confluence or a Free subscription for Confluence?
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