You're the only one with access to your client files, if you didnt back them up, unfortunately they're gone.

Tried getting an IT person to try and resurrect anything on the hard drive?

I use Carbonite as well and almost did the same thing as you this year, I totally forgot to tag the 2022 data folder back when I installed 2022 for backup until late February, I suddenly noticed the little dot wasnt next to the folder!