If you upload content from multiple sources, or reupload/repurpose someone else’s existing content (ie “reuse content”) then you won’t be eligible for YPP. Check out the FAQs and best practices here: https://yt.be/help/reused-content … and you can always reapply in 30 days.
If you already made changes to your content, the next step is to reapply in 30 days from the date you received your email. That will send your channel along to the YPP team for a new review. Our team isn’t able to get your application reviewed faster, thanks for understanding!