Reused Content is not about Copyright (or permission, or fair use, etc) and is separate from YouTube’s Copyright enforcement – it’s part of the Content Quality section of YPP policies. Here’s more info and best practices to help you make changes: https://yt.be/help/reused-content …
While we can't share specifics, we recommend going through our YPP policies: https://yt.be/help/D1wB . Note that you can always reapply in 30 days. Hope this helps clarify!