I know this would never work and definitely in the minority but I really enjoyed the idea of the faction PvP (Sullon Zek maybe) or was it deity based? I don't remember but I thought it was good idea that was just really poorly executed. Not to mention you just don't have the population to support it.
There was a time when EQ2 PvP was a blast and for whatever reason they kept manipulating it until they were making it worse with every change.
They really need to do a TLP with special events and replicate some of how the Season of Discovery is working. They need to take 1-2 major encounters in each expansion as they open and do something with them. It fits well with the 25th Anniversary as well.
They could reimagine...
Permafrost and Vox
Seb and Trak
Sleepers Tomb
so on and so on...
Since we are probably not going to get remastered EQ I think people would like to revisit moments of EQ with some added twists, special rewards, etc.