If your channel is out of compliance due to reused content, this means that the content is not original/is auto-generated. More info: https://goo.gl/E5dgGo . You can make any changes based on those details & always reapply after 30 days.
"reuse" seems to be a broad category meaning "YT doesn't think it's your content" the goal is to emphasize the parts that are unique to you. Facecam is safest. I've seen a few voiceover channels successfully appeal (e.g., Alzabo).