You may 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, or if you've deleted videos you may be ineligible: https://yt.be/help/YPP-review
This means the review team didn't reach a clear decision during the 1st review, which usually happens if your content is close to not meeting our policies. Take another look at YPP Policies & you can use this time to make updates. More here: https://yt.be/help/YPP-review