From the data, your audience retention is relatively the same as views. Which means people are clicking on your thumbnail but they aren't clicking any more. So I will suggest you do AB test for your thumbnails to see which ones is working most.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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You can also check that from your analytics, video with highest ctr. If the thumbnail is OK is will suggest you check your content. For more info you can check out my video on how to get high audience retention on YouTube.https://youtu.be/MwJWErs2VbM
Thanks. Twitter will use this to make your timeline better. UndoUndo
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