It's so absurd I'm just laughing hysterically. You passed ARR, HW, SB, SDB, EW, eventually you passed DT. I don't believe that a person in so much time after so many levels hasn't learn such a trivial thing as ‘Get out of aoe’. And okay if it's your first dungeon or raid and you die because you didn't know some attack - that's fine, it's a learning process. But if you die from the same attacks 4-5 times in a row - it's not the combat problem, it's your problem that you just don't want to put in more effort

P.S. Usually in all games it should always be the case that the further you play - the harder it gets. DT after EW (especially after EW) handled it very well