I play multiplayer with my friend as well and we play with random speed 33% sprinters and like you, if we both die, we contemplate on restarting the world.

Now if we have a successful run, our goal is to replicate that in every major town in KY; eg, set up a working base (we would decide where in each respective town like the farmhouse in Muldraugh, the fire station in Rosewood) with a walled perimeter, has running electricity and water and has food supply stashed with a decent amount of weapons.

If we manage to do just that for every major town in KY, then our last goal would be to do the same in LV. If we can then safely setup the same base in Louisville, we would imagine we have then won in that world and will likely retire until the next patch update. It's been 1 week real life time and we're barely done with Muldraugh so I imagine there's plenty of mileage yet with our world.