How to Reroll Account
My personal walkthrough on how I was able to reroll / relink Steam account:
Delete main account on Steam > Wait 7/14 days > Uninstall Limbus Company > Delete recycle bin of all Limbus > Delete Limbus Company folder in Registry Editor:
Install Limbus Company again on PC > Reseted.
Maybe it works too without uninstalling Steam itself or waiting for 7 days.