Hole Ho!
The visible universe is homogeneous at large scales. Fortunately, at small scales, matter coalesces around the galactic centres:
You are free to declare that WCPs behave like regular matter in this regard, and there are more of them in the middle. That means to find many WCPs, simply head hole-ward.
As you get closer to the centre, you will find more WCPs. Open them all and check is the end andany closer to the centre of theirits respective galaxy than the start is to its own centre. Proceed like this. You zip zap zoop between causal patches but you tend towards the centre of SOMETHING. And every step closer to the centre means more holes to open and more potential alien civs to encounter.
I think the best bet is an advanced alien civilisation discovering you, rather than you discovering them. The problem is that causal patches are big. Billions of Buzz Lightyears across.
Even if you and I are in different causal patches, and I know all the WCPs in my shoebox lead to your patch, then in all likelihood the first one I open will be many lightyears from your home planet. Plus opening that single WCP immediately kills off the potential wormholes from the other WCPs in the shoebox. So we both now have no hope to meet each other.