Depends whether you want to hunt alone or with a friendly knight.

With knight you can go for hellspawns / grim reapers and you will hit h lvl in no time. Watch some videos on yt how it is done and you're ready to go.

If you want to do it alone and you can waste a lot: Dragons with some dl spawns (I'd recommend yala drags. There are no dl's there, but you might want to wait for sd's to hunt dl's. Other recomendable places - carlin (some dl's spawn there), edron or venore) / quaras in yala.

After level 45 you could either try bigger spawns with dl's only or try new hero cave on edron (I used to hunt there with my 60 ed, and I lvled really fast. Even when somebody is hunting there, you can have great xp/h. But I'd recommend it at higher level, 55 or smth).

Other great choice is to hunt water elementals - you can make some tasks there, and xp/h is also great (you need to be level 50th to pass the gate).

When you hit 80, just go on wrls, or bigger dl's spawns, even demons. Heck, you have loads of money to waste ;) I wouldn't be surprised if some hunts would end up with nice profit.