Exchange rates patterns are very tricky. It often depends on time frequency you are looking at.
Let me give you a couple of references:
- At high-frequency a good reference is: Fourel, Rime, Sarno, Schmeling and Verdelhan (2015). The first paragraph of that paper answers your question:
At intraday frequencies, no economic variable is known to describe
exchange rate dynamics, except for their associated order flows, a
quantity-based measure of buyer-initiated and seller- initiated
orders. In this paper, we show that common, currency-based factors
describe exchange rate dynamics at intraday frequencies at least as
well as order flows.
- At low frequency, again academics have had little success. From the same paper as above:
Under rational expectations, exchange rates respond to macroeconomic news and instantaneously adjust to the new equilibrium level implied by macroeconomic news. The literature has generally struggled to find hard evidence that this mechanism works. The typical finding is that many news announcements have no perceptible effect on exchange rates.
So basically even academics don't know what explains exchange rates. The seminal contribution of Evans and Lyons (2002) documented the strong relation between order flows and daily exchange rates. But that's about where our knowledge stops.
There have been some progresses in related areas such as why the US dollar earns a safety premium: Maggiori (2017).
A good place to start reviewing the literature is Kenneth Rogoff webpage:
Basically, you can find a lot of interesting papers that relate to your question. Unfortunately most of the times you will find that there is not much predictability. A few examples: