Excel File reverted to previous version after power outage

I had an excel file simply called "bills" that I've been using for the families accounting. I run some server stuff on the computer so its on 99% of the time. Today, the power cut out for about a minute and after rebooting the excel file got reverted to a version from November 2025. I have for sure saved the filed weekly if not daily since then, have autosave on, I have powered off the computer for updates and whatnot and reopened it and continued without problems, but now suddenly all that work has been lost.

I have checked the auto recover feature, again only versions from way back last year. I've been told to check the temp files, but I'm either doing something wrong or their not excel files (made copies and trying to rename the extensions to .xls, still just jibberish). I'm freaking out because its how I budget around bills and taxes and whatnot. Its saved locally only so no cloud backups, there was another copy of it called like Bills.xlsx.xlsx but its also been reverted. I don't think I have any recent restore points either, but everything else on the computer is up to date after the power outage so I have no idea what happened. The ONLY thing that I can find that got reverted was excel, and I have no clue why or how, but urgently need to fix it.

Any advice at all would be great, Microsoft support told me to kick rocks since its "Office Home & Student 2019" and therefore not their problem and I'm on Windows 10.