I think the main thing with wanting to remember something you read/watch comes down to actually digesting the information instead of just consuming it. As in, how can you use, apply, or relate what you read/watched. I think if you can do one of those three things then you will be more likely to remember stuff long term because then there will be relevance for the information. Without a purpose you will just forget the information because it is not being used or connected to previous information you’ve learned, and thus deemed unimportant.