Spaced repetition is more broadly applicable than spaced repetition with flashcards. You might either put cards in Anki instructing you to do more complex review tasks when they come up or otherwise build regular reviews of material into your schedule.

Spaced repetition is applicable everywhere where knowledge is important.

There are areas where deliberate practice is more important than knowledge. You won't get much better at sprinting 100 meter by memorising knowledge.

Econometrics sounds to me like an area where knowledge matters. I think that when you think of knowledge as primarily being about memorising dates of kings and battles you think about knowledge the wrong way.