Here are a few solutions from other users:
I finally discovered what was going on with mine. When I originally installed Turbotax, it picked up my previous file from my Windows File backup location, so it continued to save everything in that location, not the actual active file location. I just have to remember to check that next year.
https://ttlc.intuit.com/community/taxes/discussion/re-tax2023-file-disappeared/01/3315626#M1220196
https://ttlc.intuit.com/community/taxes/discussion/re-2023-tax-file-missing-after-extended-search-th...
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