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First, this is not Adobe. This is a user-to-user forum. So it's not "our" app.
Second, you've posted to the Premiere Elements forum. So we can't help you there.
But I'm glad to move your post to Premiere Pro forum. They aren't Adobe either -- but if you're interested in resolving your issue, they may be able to help you. But you will need to provide more information about the video you're working with, the computer you're working on and, at the very least, your operating system.
Did you create backup files?
Premiere, by default, saves backups of your project file. Check your backups folder for an older version and see if that restores your project.
try to search the 'Auto Save' folder for any possible copies
He put a happy face!
You need to make a habit of making backups not just rely on auto save.
Because when your project gets corrupt without you knowing so might all your auto saves.
Making backup will reduce your loss.
Sorry that you are having trouble. My guess is that you used the "Save As" command, then named your project the exact same name and then everything closed, including your sequence (Timeline). This can be confusing, but the good news is that your work was likely saved.
My advice is to look in your Project panel and look for the sequence you created by double clicking on the sequence icon. Did you get your sequence with all your work open again? Please let us know.