I suggest something that a lot of other MMORPG games have, "dungeons". Adventure/exploration content that is normally quite popular as PvE content.
A new type of temporary wormhole that is either completely random, or maybe around neutron stars or stellar black holes.
Entering these special temporary wormholes would takes you to a temporary solar system filled with space monsters, space pirates and loot. After a couple days the temporary solar system explode, destroying everything left inside it and the wormhole disappear.
This would however require more pirate blueprints and maybe some new space monsters to be created. And of course we would need some new interesting loot to find.
A new type of temporary wormhole that is either completely random, or maybe around neutron stars or stellar black holes.
Entering these special temporary wormholes would takes you to a temporary solar system filled with space monsters, space pirates and loot. After a couple days the temporary solar system explode, destroying everything left inside it and the wormhole disappear.
This would however require more pirate blueprints and maybe some new space monsters to be created. And of course we would need some new interesting loot to find.