Host custom events more often. let stuff people want drop in dungeons, that nobody does anymore ( for example esoterrace). to encourage people going there. it could be
- enchantment stones
- tempering( low droprate)
but also 30 day versions of:
-skins, mounts, miols, etc.
change loot in instances to boxes for everyone, to encourage full grp again. im sick of this duo or trio bullshit.
give gp for pvp dungeons like dredgion and for pvp kills, arena -> so that people who start from bottom have a chance to become someone
gp kill quests, as someone else already suggested would also be a good thing to revive the server.
also manastones, enchantment stones and tempering would be a good bonus for said killquests.
if possible try to add dungeons from later patches, maybe temprorary as events, like : makarna, garden of knowledge, etc...