How many attempts? Did you look at logs? You’ll be surprised how much you’ll learn.
There’s a difference between doing mechanics properly vs efficiently. Quick example. For Beatrix you can have a mage spread living bombs. But what are they doing with their hot streak procs? Did they make a target Beatrix cast pyroblast macro? or target mage pyro blast macro? or did they just lazily send it to some garbage add that can be ignored.