If you want to go to purgatory, go to the Demonic Backwaters map, and the experience will be 900 or 1,200.
If the plug-in is set up, you can go to the 7th floor of the Demon Realm. The experience is: 3700 for the Anti-Demon Bow and Arrow, 4000 for the Anti-Demon Guard, and 4800 for the Anti-Demon Guard. You will reach level 42 in less than two days.
If you want a free map, go to Snake Valley or Counter Demon.
Snake Valley is also a good place to make money.