I wish they would balance pve for solo gameplay.

In general they should make boss runs possible for solo gameplay. Like in some events when there was a solo mode where mobs were balanced to one player.

It is really frustrating for casual players when only few people play pve outside of events, but bosses are too strong to be fought alone. Nowadays if you just want to hop on and do one quick run, you cannot fo that (unlike in the past when there were 100x more active players).

Also they should find a way to make pve rewarding again. Like in good old times where dropping a special item meant something. I remember how rare dragon sets where in mount fang times.