HELP! Full project reverted to blank starter map, please tell me there is some way to recover.

IN DESPRATE NEED OF HELP! About 20 hours of building a detailed restaurant concept, tons of saves, I have opened and closed with no issue prior. When I opened today it was empty, with just the base starter content (floor, two chairs, table…) I have looked everywhere but cant seem to find what happened to all of my work. I can always just redo it but ■■■■ that is a lot of lost effort…

Using UE 5.0

Open that level from the bottom