Leveling only with instances

Hi i have a 19 sorcerer and im doing BC at the moment but i think if now i can level only with instances if is nothing needed from quests.

So i can level up to 25 do abyss plus another instances and that.

Is ok to level only with instances? plus i can do some quests for gold and for level up the collecting skill.

It's perfectly fine to only level in instances, however some instances only let you enter once every 18 (maybe 24) hours or so. But places like Fire Temple can be farmed over and over.

u will lose titles given by missions and quests ...

Ok the thing is im planing to only do Campaign quests and the rest Instance grinding a friend told me that i level faster with instances.

im 20 atm