I can safely say, even though I am 2000 uscf, I am probably the worst calculator of the bunch that has ever reached that mark and surpassed it.
So in order to beat me, for example, all you need to do is beat me in a position that involves calculating a lot. I will blunder quite a bit. I like simplicity.
But truth be told, that's only one strategy to go about things against a 2000. My preferences are different from other 2000s and above.
Knowing your opponent, their strengths and weaknesses will help a lot in attempting to defeat them.
Just keep working hard on it.