When we enter an echo, we have a mission and we try to accomplish it.
What if we had no mission? I mean, when starting.
We enter an echo then search for a first step (maybe a NPC) that will give us the real objective.
What if we had multiple missions?
We enter an echo then search for our first target. We kill it and at that moment we have the direction to the next one. Something like the patrols, but static and one by one.
The idea between this is to bring some new kind of objectives and hopefully find a way to explore more of each echo.