Why people isn't selling in front at this 6000btc wall?

Why people isn't selling in front at this 6000btc wall? pls

I didn't expect this rally, after a gain of 25% in 7 days I thought the price would have dropped a bit to stabilize.
Luckily I was still holding, but now I'm going to sell a little portion of them...
Someone just removed a huge sell wall at 665$, let's see if this will take the price to 670$ (1650 btc to break through it)