In SketchUp, look at the File menu. That should have a list of the recent files you have worked on. The welcome screen should also show the file, and it may say Recovered on it. That file is the auto save copy of the file.
You also can go straight to where the auto save files are stored, by copying and pasting this text into File Explorer:
%LocalAppData%\SketchUp\SketchUp 2021\SketchUp\working\SKETCHUP\RecoveredFiles
Any files you were working on when a crash happened should be in that folder. If you see the one you need, move the file to a more normal folder, Documents for example, then open the file to see if it includes your latest changes.