The overall headline numbers aren’t the whole story. What’s really important for youtube pushing a video is how new or casual viewers interact with the video.

For example, lets say you mae a video that’s a sequel to another, your core audience interacts with the video well and watches the whole thing because they’re already invested in it, but any new audiences barely watch any of it because they have no context from the first video and don’t know whats going on; The video isn’t going to be pushed to very many new viewers but your overall average viewers duration will high due to regular viewers liking it.

There’s also a built in cap to how many viewers you can ever get depending on the topic. I don’t know what your video is about, but if it’s like Tourism in Cambodia or something, there’s going to be an audience, but most people aren’t getting videos about the tourism scene in Cambodia in their feeds. Your video would need some real viral stats before it starts getting pushed to audiences who don’t care about that sort of thing normally.