Do you remember the file name or approximate date it was last modified? Also, was it saved on your computer or in OneDrive or another cloud location?
First, open Excel and go to File > Open > Recover Unsaved Workbooks. Excel often saves temporary recovery versions after a crash. You can also check the AutoRecover folder directly, usually found at C:\Users\YourUsername\AppData\Roaming\Microsoft\Excel. Another important place is the Temp folder at C:\Users\YourUsername\AppData\Local\Temp, where Excel may leave temporary copies. If the file was stored in OneDrive, sign in at https://onedrive.live.com and check the Recycle Bin and Version History. If the file was recently deleted, it may also be in the Windows Recycle Bin.