I tend to ignore the whole context thing in Phoenix, it confused me in the beginning when I was learning about Elixir and Phoenix. It's a design pattern instead of a core functionality of the framework.

Just think about what are good interfaces and abstractions. Seperate your core functionality from your "view" functionality as Phoenix sets it up for you anyway (App = core and AppWeb is your external view layer, being a webpage, json api, liveview, etc). You might end up with something that looks like a context and that's ok, but it shouldn't be what you start from.