Disclaimer: i have already said this on my second account (LazyTurtle) and i think u havent seen it so im just gna say it again, and if u don't believe min LazyTurtle, then give my second account the credit for the idea
i think u should make dungeons, I got an idea of one of the concepts of a dungeon (it would be best if there is more than one type of dungons) its a dungeon where u have to go trough 3 floors: floor 1 is where u have to kill a hoard of minions (maybe like 40 and they come 10 at a time) and when u have killed 10 a new hoard appears. I think they should have high attack but low defence and health so it wouldn't be to hard, and once u have killed them there would come a mini boss with like 10k health (depending on lvl but I think that lvl 10+ should have a boss with atleast 8k health, else it would be to easy :D) and once u kill that boss a new floor appears (floor 2), floor 2 is a puzzle and there isn't to much to say about that :D The last floor is the end boss, I think it should have 30k health (again, depending on lvl) so it wouldn't be to ez and not to hard. And at the end u would get 2 loot chestes instead of one since u did a lot more stuff than the other bosses/quests. That's what I had in mind of what one dungeon could be :D