My Apex Legends account on Steam(800-900 hrs on it) has been reset to level 1

Hey qje1njjo3uz6​,

Usually when your account appears to have lost progress like this, it's due to unlinking a platform or linking one to a different EA account. 

Progress is stored on the EA account level, not on individual platforms like PlayStation, Xbox, Steam, etc. This means if you link your platform to a different EA account, you'll lose access to that progress and it will appear to have reset. Progress cannot be moved between different accounts.

In this case, the EA account you're posting with was created pretty recently, and was not around at the time of Apex season 6 - 9. You'd need to locate whichever account was used when you played previously.

We are not able to make any changes to your account status or progress via the forums, but if something was linked or unlinked incorrectly it may be worth contacting support to see if the original platform can be re-linked.