I hope you changed all the keys on this account and stored them in cold storage. Mine are on a USB stick, that I rarely plug into the PC. This sucks... what happened to you, keep going.., you will get it back eventually.
I remember ceremoniously placing the keys on a usb stick. But I was pretty ignorant and reckless back in 17/18. I think what caused this disaster was not changing my keys on HIVE from back in the steemit days - and some website requested my steemit "password" and like a dummy, I probably put it in. The thief liquidated my old STEEM account first, probably logged into HIVE just for kicks to see if it would work.