What Is The Best Level 34 To 50 Grinding Location?

Please let me know, I am have much difficulty leveling. I currently play as an assassin with a dislocator as my strongest weapon, which really complicates questrunning unless I am assisted by another player.

 

34-40 would probably be the abandoned mines (connection between Rymek and the main part of the mines), 40-50 would be the wolves' den near the Ice Barrows dungeon and 50+ would be farming Naga's near the pools in Olux's swamp I guess (or maybe Herb Cave, though that might be too high of a level). Also I don't really get how quests could be too hard. I don't really recall there being any hard quests in that level range.

 

Another 40-50 spot is the cave to the left of Lusuco guarded by the golems. It has level 47 mobs with a good spawn rate. Otherwise; Stormarend is correct about the Nagas. I farmed the spot to the East of Olux where it is part of the quest to get Naga tails (it's not too far from Olux).