If you're looking for breadth, here's a bunch of Wikipedia categories that I sometimes revisit to pick out something that sounds interesting and new:

- https://en.wikipedia.org/wiki/Category:Technical_communicati...

- https://en.wikipedia.org/wiki/Category:Knowledge_representat...

- https://en.wikipedia.org/wiki/Category:Information_science

It really is a idea-rabbit hole though, and kind of hard to stop yourself from wanting to create N new projects based on every new idea and perspective you come across.