It seems pretty much confirmed we can see Ethereum going under $400 these days.
Qn - Is it a good buy under $400 or wait for even more price drop?
I think it is a good buy, as well from a technical point of view and also from a fundamental point of view. Because technical analysis is only good for short term, but for the long term the price will be regulated by demand and by supply. And there are so many institutional investors into the game now that I can not imagine the price ever drops below 350 USD again.