Compared to 1.x we have now a lot of ways to level up a class.
During 1.x you had leves (8 for DoM/DoW and DoL each 36 hours and 8 for DoH each 36 hours), Behest (all 30 minutes) and common Exp party on common open world enemies.

Dunesfolk for Dinner (a very popular Leve during 1.x): https://www.youtube.com/watch?v=pNKuxqV8HRE