Rember Grexit. At that time Euro came under severe selling pressure because people were worried that Greece exit from the EU could result in other departures. That is now all forgotten.
Surprisingly, BREXIT so far resulted only in week GBP, because the markets have been focusing on what will happen to Britain after its departure from the EU. The markets devote little attention to what will happen to the EU. The is wrong. If Grexit resulted in worries about the EU future, Brexit would likely result in significant larger panic. When this happens, the markets will sell EUR.
So if you believe, that Britain is on the way out, then you should get ready to sell EURUSD.