Move the USB back to PC. Use Save Wizard (paid) to "resign" the save. Select your profile (the PS4 account you want to use) and apply it to the downloaded file. The software fixes the encryption.
When you plug the USB into the PS4, go to Settings > Saved Data on USB > Copy to System. The PS4 will likely say "No saved data found" or "Corrupted." Save Game Ps4 Download
Google "God of War save file 100% CUSA-07410" (check your disc case or digital store region for the CUSA code). Move the USB back to PC
Always use official USB or cloud backups for your own saves. If you have lost data, consider replaying the game—many PS4 exclusives ( The Last of Us Part II , Ghost of Tsushima ) have incredible replay value. The software fixes the encryption