If you haven't heard back yet, this usually means your channel is being held for additional reviews (bc your content is close to not meeting policies). It's best to check the YPP Policies & you can use this time to make updates. More here: https://yt.be/help/YPP-review
We’d recommend reviewing the YPP Policies again: https://yt.be/help/AsbB and making content updates to more closely align with those guidelines. Note that there’s no way to expedite this process – so just keep uploading original content and building your audience in the meantime.