If you can do it, truckers (level 48) in singapore is pretty good and low key since it gives the same amount of exp as some level 53-54 monsters in the game world. Lots of elixirs and chocolate drops so you shouldn't worry about much about running back to buy potions/food if you have a pet with an item pouch equipped. Very good for ranged classes since there's a platform to snipe on for all the platforms the truckers spawn on. I leveled there on a assassin though, so I don't know how smooth bandits have it. You can stay there until 60 if you want to since I haven't found much other maps where you can just 1/2 shot the monsters, or has good enough map layout to do a good farming rotation. While scarecrows gives the best exp for the 50-59 bracket (a bit over 700 exp, equivalent to exp from killing level 60 monsters), they're extremely scattered and chimney maps being inaccessible means the maps they're available in are diluted with other monsters. Honestly, there's not much decent spots to grind around 50-60 since you'll either pot burn those levels or go back to doing high level 4x maps.
Go to Mu Lung and do the quests where you have to kill a certain amount of straw target dummies. These quests give a really good exp boost at lvl 5x.
