While we can't share specifics, we recommend taking a look at our YPP policies and make changes to your channel/content accordingly: https://yt.be/help/AsbB . You can always re-apply for monetization after 30 days. Hope this helps.
Thanks for the info and sorry you've been waiting so long. Our team would like to take a closer look at your channel before making a decision. Creator Studio doesn't show this, so this may be confusing. As it’s taking longer, it means your channel is held for a second review.