Edit the title of this thread and provide more details so that more people will answer. But in general you should save symbols and footprints you created to your own libraries. Saving them to the system libraries is a bad idea.
Using your OS make copies of your personal symbol & footprint libraries.
Open kicad 6 and go to Preferences / Manage Symbol Libraries / Select Global / Select “+” then add the copies of your symbol libraries to the bottom of the list. You can navigate to those libraries with the black Icon.
Finally, click the “migrate libraries” button.