Premiere Pro 2021 Refusing to Load My Project
Have you tried resetting preferences and/or plugin cache?
From here:

Press Alt (Windows) or Option (Mac OS) while launching Premiere Pro.
You can release the Alt key or Option key when the splash screen
appears.
To reset preferences and plug-in cache at the same time, hold down
Shift-Alt (Windows) or Shift-Option (Mac OS) while the application is
starting. Release the Shift-Alt keys or Shift-Option keys when the
splash screen appears.