Leveling up low leveled battle classes a HUGE issue at moment.

[Mogbranth]

I do leves

→ 10-20: Western La Noscea - Aleport or I go to The South Shroud Teleport Crystal
I mix it up with leves and FATEs whenever they are on. When I'm lv 10 to 14, I do leves lv 10 on max, when i get to lv 15, I do leves for lv 15 to max.

It should take you an hour an a half max to get from lv 1 to lv 15.

→ 20-28: South Shroud - Quarrymill
I do leves around the Teleport crystal and i also set the home point there. When I see some FATEs up, i run there.

→ 28-34: Eastern La Noscea - Costa del Sol
I mix some leves up until I get to lv 30 and then I only do FATEs until lv 34.

→ 34-40: Coerthas Central Highlands - Camp Dragonhead
No leves here, just go full FATE here.