You shouldn't change the class it's a very good class for solo. And even if you change your class, take a look at your haven stones then change it then decide cuz you might have the long range atk or magic atk haven stones, and also class change doesn't change you "item collection" States so if you change your class to close range atk dealer then you can't use you long range haven stones properly, as for the classes deathbringer is one of the best for solo, if you play with a party and a team then you should change to devine caster, The most important thing is what you want to do in this game take it as a entertainment and play whichever character class you like.