Practice practice practice. Learn the map layouts, learn approach strategies by using abilities and the environment. Choose a weapon and ability set that suits you and master them. Watch your radar constantly and learn to pick your battles. Win some, lose some. Complain on the forums about balance, get told to git gud, respond in kind. Play Iron Banner when it comes around. Gain metagame experience. Learn to despise point A on Blind Watch. Take a break and run some raids. Then practice some more. Hope this helps.