future - 800 is a near impossibility for most people. Even if I were that smart, on the day, even the slightest of things could go wrong and result in one or two incorrect answers, which is all it would take to get a score below 800. I don't think anyone on gmatclub has actually managed to score 800 yet. However, you will see a lot of people with 750+ scores. This to me is a more realistic goal.
There's are few people who retake tests despite scoring low 700s.
You can search for their stories :
ncprasad - from 740 -760
pelihu - from 730 - 780
swbluedevil - from 720 - 750
Things I'd do (or rather am doing)
Fundamentals review. I still am shaky on some basics - combinations, probabilities, even number theory and tough word translations. Also fundamentals of sentence correction. This is the most "improvable" part of verbal.
Volume practice - loads and loads of it. 1000 SC on gmatter + 1000 CR + 5
MGMAT tests + 25 Gmatprep challenges.
Also practice with LSAT stuff to improve CR and RC.