Any endgame content in GW2 can be better with a good build! Convergences are no different.
I'm not going to create a bunch of builds for you, as there are already plenty of websites for them.
It's recommended you bring a raid/strike build.
Here are some build sites in alphabetical order:
Discretize.eu (focused on fractals)
For Convergences, there are a couple things you can do that will be more effective than a standard raid build IF you are using a Power build.
The SotO convergences happen at night, letting you put on a Superior Sigil of Night for increased damage.
The Superior Sigil of Demon Slaying gives a nice 10% boost against BOTH the Soto and JW convergences.
Sadly, condi and heal builds get no concessions in convergences.