If you weren't keeping off-site backups yourself, there isn't much you can do. Your site, unfortunately, was not indexed by Archive.org's Wayback Machine (that's pretty typical for forums and other "ephemeral" sites), and your data and files would no longer be available here. You do still have your EU domain, which you can point to any hosting you can get if you wish to start over.
Keeping up with the policy changes was sort of your responsibility. (It was also one of the main reasons why users used to have to log into the forum here -- the hope was that they'd read the news and announcements, as well as the "useful information" and "service alerts". For users here, it's still a really, really good idea to log into the forums and read those sections for changes at least once every couple of weeks.) If you'd just maintained your account (assuming you were suspended/terminated for inactivity) it would still be going, and the fact that no new accounts can be created from Poland at the moment wouldn't matter to you. Losing the files/data for permanently suspended/terminated accounts has been part of the ToS here since I joined at least, even if other specifics of the ToS have changed (such as what constitutes "activity").