Hmm, ALL ways are possible
That's why I love a free-to-go-world-RPG!
The first time I played, I kill most of the goblins in the Orobas Fjords before having my Battle Tower! But this time I will go faster to the Battle Tower

!
It is nice to do all things like you wish to do ... totally freedom, love it!

(and that's why I find it very sadly I CAN'T go back to the Orobas Fjords after going IN the Hall of Echoes !!!

)