What services are there that recommend content for all media types based on my preferences like GoodReads does for books?
There is no general-purpose recommendation service which can produce personalized recommendations for all the different media formats. However, many specialized services exist:

1. Book websites and apps like Amazon or Google Books. These provide a large selection of books in various genres, often with reviews and ratings from other users (or sometimes algorithms).
2. Blogging platforms such as WordPress or Medium where you can create an account and write articles about any topic under the sun. Articles will be indexed by search engines and displayed to your followers/readers who might find them interesting.
3. Podcasts and radio shows such as The Joe Rogan Experience, This Week in Tech, etc., which have dedicated listeners willing to listen to specific topics over time.
4. Music streaming sites such as Spotify, Apple Music, Tidal, Pandora, or others that allow you to follow artists and their releases if they offer this feature.