Easy way to get players to come back and attract new ones...
Add more achievements.
No EGO reward needed, use salvage and script as the payout instead
Even if there is no new content, players still want to keep themselves motivated with goals and play the game. So how about a bounty board?
Seeing how society is more on the badlands side, I'm sure there are lots of criminals that law keepers need help with... Make them like emergencies that spawn when the player gets close, or make it a phased event. This is a good way to add more achievements and action. Also a great way to keep the interest level up.