Re-run Pixel 4 Setup
If you are not familiar with ADB environment, then the most suitable solution for you is to Factory Reset your device. However, if you are familiar with ADB, then follow this:  

adb shell su
pm enable com.google.android.setupwizard/com.google.android.setupwizard.SetupWizardActivity

adb shell settings put secure user_setup_complete 0



  Please note that the commands are case-sensitive and require
  permissions.