It seems pretty much confirmed we can see Ethereum going under $400 these days.
Qn - Is it a good buy under $400 or wait for even more price drop?
I think the price of ETH will down to 350$ and will increase again
But it depend on you if you want to buy it and after that just hold it until the price recovered
I don't think Ethereum would go down below 500$ anytime in the future, market is pretty much recovering again and with the positive news from G20 summit, it's highly possible for market to go even higher. I think this is the right time to invest before we see a bull ride again.