Thanks for the tag, we’re gradually rolling out channel memberships to eligible creators. You’ll be notified if you’re able to add the “Join” button to your channel. More info here: https://yt.be/help/tmhG
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
It has been 4-5 months since you said we will review your Channel.... 