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?
When ETH will go $400, I think it will be the best time to reinvest in ETH. But I am afraid about ETH value, I think it can't reach $400, but there is a possibility to go at $420. So this is the time to invest in ETH because it has great future and I think it will reach again new value so wait until reaching new value.
Yes, it is always the right chance to buy when it reaches 400$ because there will be huge competition when it reaches 400$. Still, it is very pleasing price to buy ETH because there is huge growth in terms of ETH price in coming days.