1. Populating world and rewamping loot system. Huge neocron world is useless since most areas are empty and not worth going for, and pve concentrates only on specific hotspots. There are dozens great locations in Neocron wasteland and elsewhere - make use of them. Aside from creating better mob spawns, loot system itself should be rewamped so that there would be reason to kill different kind of mobs.
2. Additional progression system/goals. Maybe by making Achievement system scoring few dozens different achivements and some kind of reward (even if cosmetic/furniture) for completing them - once again aimed at seeing and doing maximum of content Neocron has to offer - pve, pvp, exploration, flying, droning, crafting, researching etc.