I think a lot of people are waiting for $AMZN to break above this $191.70 ATH level before entering, $GOOG has pushed higher today and the Mega Caps remain in a healthy position, $AMZN's fundamentals are getting stronger too, so I see no reason why it can not break above this level after testing it a number of times now.
I added $AMZN at $185 a couple of days ago and it is my Mega Cap of choice to build my portfolio around for many years to come, so naturally I am leaning on the side of being bullish here.
If you want to wait until the breakout is confirmed, that is a sensible choice and how you should treat the majority of your buys.