What are some good YouTube channels still currently working in genres which aren't currently popular because of algorithm shenanigans, the natural cycle of trends, or whatever else? I'm thinking like sketch comedy, original animations, serious short films, etc.

Identify a topic/target audience and a piece of "required viewing" for that topic/audience.

"Required viewing" means that you consider the video content you've chosen to be so important or relevant that it is essentially mandatory for those interested. Also, explain why you feel so strongly about it. What makes the video "required" rather than just "preferred"? What makes is stand out over other videos like it?

For example, maybe there's a concert video that you consider essential for rock music fans. Maybe there's a TV series that's an essential introduction to space exploration. Maybe there's a movie that's a must-see for new parents.

Any video media is fair game. Movies, television, online series, livestreams, documentaries, YouTube videos. Whatever. Also, if it's publicly streamable, include a link for us!