In quite some MMORPG's, leveling is mainly done by questing.
So I was thinking, why not make questlines in each city/map which actually get a player to the level required to go to the next city, where he can do the quests there.
For example, I'm a newbie, visitor level 1.
I start in Adventure's Plains and take a few quests there and complete them, by the time I completed all/most, I've reached level 10 which allows me to get a job and move to the next map, Valley of Luxem Tower, where completing the quests will get me level ~15 and so on.
This of course has a lot of options like primary questlines and secondary/sub questlines.
The main reason I'm suggesting this is because the only/fastest way to level is simply by grinding, which attracts a lot of botters. (and can get quite boring sometimes)
If there was another option to level, I'm sure many people would prefer to quest instead of grinding for 10 hours.