Thanks for reaching out. Just to confirm, was your channel part of YPP earlier and now demonetized, or is it the first time you've applied and were rejected? Let us know.
Appreciate the info. We’re not seeing a lot of public videos on your channel, so it’s likely that our review teams don’t have sufficient content to review keep uploading more original and public videos. You can always reapply after 30 days. Hope this helps.