Hi!
I would like to suggest the books of Orison Marden, Masterful Personality and Please, Power and Plenty to be narrated.
They are powerful self development books that may help a lot of people. They are as good as the ones already beafifully narated and available at Librivox. They are public domain as all of his works. They can be found at:
https://babel.hathitrust.org/cgi/pt?id=umn.31951001505766n;view=1up;seq=7 (Masterful Personality);
https://archive.org/details/cu31924029125504 (Peace, Power and Plenty).
Regards
Pedro