I already asked for this in suggestion section, and it was rejected. I know it'll never happen on Royals, but still, I give you my biggest like.
Some item or hard quest that will increase hp dramatically hence reducing the need of up washing and making low lvls fun like old days
Bring barlog expedition to the game. Great way for lower levels to level and get some decent funding. Make it only 2nd job skills and to drop decent equipment or items to entice newer players. Very nostalgic expedition worth the time to invest
I wish all etc can be useful ( trade for pots, items,scrolls...etc) not being npc or drop. And mob spawn speed up in some maps
More quests at the later levels that are really challenging. Maybe some job specific timed quests. Or make some existing ones repeatable.