How do I recover a extremely corrupted file?

Hello everyone. I'm seeking for help because we had a power outage at my job earlier this week and a file we use a lot was corrupted. I have tried everything I can, from clicking "Open and repair" to using HxD to see the decoded text, actually this is a list of all the things I tried so far:

.- Checking the previous versions or unsaved files, and find nothing (I don't use the computer where they keep that file, so don't blame me).

.- Uploading it to Google Drive and try opening it with Google Sheets.

.- Extracting the data.

.- Switching to LibreOffice.

.- Renaming the file.

.- Changing the file extension to .xlsx and .xlsm.

.- XML inspection.

.- Tools like Stellar Repair, Wonder share Repair-it, Kernel for Excel, pretty much every online tool I could find and findstr.

The closest I got to something was when using the HxD software with a different file extension of the file (.xlsx), since on the original there was no info displayed on the software, therefore not much for me to work with; but it did showed me that the file size was still there, so I thought that at least some data was also scrambled inside. With the .xlsx file, I used the decoded text section to try and guide me on the recovery of the file, but I think is just the XML code and Excel stuff rather than the information we want to recover. I know that maybe some information may not be readable through the decoded text, but even when trying to use IDE's nothing was shown besides signs, question marks and like... 10 letters.

I would really value your help on this issue that I have, any advice is appreciated. Thanks for reading.