This means we'd like to look more closely at your channel before making a decision. The best thing you can do is keep uploading original content as the more info/content for us to review, the better and you should receive a second update in the near future.
We don't have an exact date or time frame, but the additional review will happen in the near future. In the meantime, keep uploading original content as the more info/content to review, the better.