Lots of obscure opinion on this thread
So far Jimania has given you the best advice
If you are still searching for a build
You need to research sword/dagger thief, shatter mesmer, celestial/rifle engi, d/d elementalist and the players who have mained them in tournaments
These are the sure fire strong metas that are highly effective if played correctly
Other builds surely can work well but the above are amazing when played correctly in the current meta