For us to look into this further, could you share your channel URL? Also, was your channel monetized previously & got demonetized now or is this the first time you've applied & got rejected? Let us know.
Any content that appears mass-produced to increase views without adding significant educational or other value is repetitious content. You can take a look at the Creator Studio links. While you have made changes, the policies may help guide you further: https://yt.be/help/AsbB