My account is gone! How can I locate it?

Hi,

I had to Dropbox accounts. One of them was linked to my old macbook. My macbook is old and I couldn’t update it properly so Dropbox would not sync anymore. I was in the process of moving my files to the computer, but now I can’t log on anymore, and it seems like the profile is gone!! And I can’t find the emails from Dropbox in my mailbox either. Everything is gone. Does anyone have a suggestion as to how this could have happened? I have not received any warnings that my Dropbox would be deleted…

Thanks for your help