A Vanguard (DPS), is a line. Nothing should cross over it and when it does you mess them up.
1. Concious of your Comp: Sometimes even if you play well can not use your kit to the fullest becaused of certain team comps. Learn to adapt.
2. Use Cover : Even though you have 500+ HP you shouldnt take unnessary damage.
3. Learn when to NOT fight : Not every encounter needs to be a full out brawl where you try to do everything. Try to pressure the enemy backline or overload there frontline with good pressure. Try to make something happen, or begin to before the fight starts.