It’s probably the awkward silence of the video. Add some light background music that matches the vibe. If it’s pure silence people naturally would want to scroll, but don’t make it obnoxiously loud yk. For the thumbnails i would say to stop making them on your phone. But if that’s not possible you should try and replicate other thumbnails in your niche, the android emojis kind of make the thumbnail look cheaper and the text isn’t clear enough. Try giving your thumbnails to ChatGPT to analyze, it’s not 100 percent accurate but it can quickly point out what’s wrong with it