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Back up your save files for the future
Any remains will be in there.
source: https://www.howtogeek.com/428491/how-to-download-your-save-games-from-steam-cloud/
Sounds to me like Steam Cloud may have done its job and wiped your saves. If you do have a backup, a matter of copying and pasting those saves in "..\My Documents\My Games\Borderlands 3\.." etc should allow you to resume to wherever it is your progress is set to as long as Steam Cloud is disabled.
Not sure what else can be done. Recuva maybe?
I don't have any backup unfortunately, I talked to the support too and there's no way to get it back, lesson learned though, always backup ur files.