I see $66k as dip, because dip simply means just dropping from high to low price .but looking the new ATH created by bitcoin which was about $75k and the dip of about $62k you would see that btc price has never dip below that for long now that is to say $66k is considered dip. So any body that want to buy at $66k should buy as dip because Btc may never go back to below $50k but we are expecting it to go above $100k a till will also come when $70k will be considered dip. So as Bitcoin is increasing so do other previous ATH becomes dip.