Hi! As we can see, ETH is collapsing, I got about 40 ETH which I bought for 450$, I know, that was mistake. Please give me advice, should I sell now or take a risk and do it when we reach 150$?
I can't see that ETH is collapsing. Yes it has dropped more than some of the other top coins, but the project is still hugely strong. I am very confident that it will recover when the rest of the market does, and that ETH will rise more quickly than most other coins. I don't think there is any reason for concern. Give it time and ETH will surely pass $450 again.
As for what to do now, it sounds strange but the best thing to do is buy more if you can as this lowers your average entry point (dollar cost averaging).