fastest way to level is to grind dungeons with 200% exp scroll from the dragon vault. If you are diligent you can get from 1-80 with the scroll in less than 2 days.
1-24 follow main story quest
24-32 do 7x gobarta in daredevil faire and then grind black sovereign domain
32-40 do 7x gobersia in daredevil faire and then grind desolation point
40-50 grind ruined village
50-60 do 7x higher level gobersia variant and then grind mutant habitat
60-70 grind golden grasslands
70-75 grind blazing caldera
75-80 grind wall of laments.
Do the highest difficulty you can without sacrificing too much speed. Generally its master until ruined village, then hard for mutant habitat, golden grasslands, etc.
plvling in this game is just that same method, but with someone higher leveled doing the pleveling. Its going to cost you around 2-3k igg to get that plvling iirc.