My laptop just went out and now my text on Libre is gone. How do I get it back?
You can see if autosaving is activated in the settings.
If not, then the file is irrevocably lost.
However, if it is activated, then something helpful should possibly be found in the directory specified in the settings:
https://help.libreoffice.org/Common/Saving_Documents_Automatically
https://help.libreoffice.org/Common/General_7#Save