Hit your attack key, generally done while facing a monster around your level.
Rinse and repeat.
Magatia can be started at 70. In fact, if I find Jesters are too full, I go to Iron Mutaes. 2 mutaes = 1 Jester, you get good spawn, and you never get hit. I would also put Aliens right at 90 since you you can get the entry quest at that level.
I agree with your paths in principle.
Hit your attack key, generally done while facing a monster around your level.
Rinse and repeat.
Spoiler!
i've lost my got damned mind
He wants to know how to level up faster not how to kill monsters...
70-110, get doored into aliens, the rest is LHC.
If you cant get doored then do jesters for a few levels then MP3 until 90.
Alright, leveling up after a certain level does seem tough though i ain't in that position but i have played a lot of games and have experienced these type of situations over there. I can't help you out now, but soon after my surfboard, i will learn this strategy and let you know :)