So can you explain why during June 20-24 when BTC was at 6600-6000, the fee was on average 2.50$ while now, with BTC over 7500$ the fee is on average 0.70$ 
Price has nothing to do with the fee, stop saying that...
Price has nothing to do with the fee, stop saying that...
That's what happens when people still think in fiat terms
While I wouldn't say that the price has nothing to do with the fee (ie. everything else being equal, BTC @ USD 300,- was cheaper to send in fiat terms than BTC @ USD 6,000,-) it definitely is one of the lesser factors as seen during the December 2017 mempool congestion.