Obviously to get instant engagement clickbait is the easy way out however one's branding pretty much determines what kind of audience you're going to keep. Someone like Thomas Brush would suggest making dev logs or livestreaming development or posting high energy and engaging game update videos. However that wouldn't work for everyone, some people wish to tell a serious story for example. Development log videos likely wouldn't fit any kind of ARG or webseries kind of branding, so for that cryptic teasers or mysterious kinds of videos would be much better suited for that style, especially for keeping retention rather than just attention. On the average it's a balance of building an audience AND keeping that audience.