You probably not have enough *public* watch hours to be eligible for review. Creator Studio shows public & private combined, but you need 4k public hours alone. Try switching private videos to public: https://yt.be/help/YPP-review
When we assess channels for YouTube Partner Program access, we need context to help us make a more informed decision about whether your channel meets our policies and guidelines. Keep uploading original content aligned with YPP policies: https://yt.be/help/AsbB . Hope that helps!