Every YPP application needs to be manually reviewed by our team of specialists. Due to the high applicant volume, it’s taking us a while to review every channel. We’ve been sharing updates about this here: https://goo.gl/juKHb2 . We thank you for your patience.
While we can't cover specifics, our Help Center article has more info on what kind of content you can monetize: https://goo.gl/P9nSKE . Hope this helps.