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 If possible you want to stay behind tanks that are using Hold the Line. You will recognize it as an animation that sprays behind the tank, and he will hold his shield steadfast in front of him. He gains a 45% chance to dodge and disrupt while you gain 15% chance to do the same. Here is the best online website for players to buy luminary gold service.
However, you can gain the benefit up to 3 times if you stand behind 3 tanks doing it, which gives you a total of 45% to avoid any ranged attack. Hold the Line only lasts a short amount of time, it is meant to get you to the action.
After you get to the fighting, it is pretty simple. Assist other players by focusing on 1 guy at a time to kill them faster, and do not go beyond the front line. The worst thing you can do is pass your tanks, because you will get tab targeted, which refers to players hitting the target closest player button and all focusing on you. You want to let your tanks take the damage that is what they are there for. You try to remain as inconspicuous as possible.
If you have 2 or more ranged healing friends that are dedicated to keeping you alive, you can really rampage and flourish in a large group situation, as long as you are a brawler MDPS (marauder or white lion) that is specialized in AoEs. You can often run in and kill several players at chokepoints when you have such a support corps.