At the moment we are in a really bad dip but always remember keep calm and hold because if you panic sell you will just loss and that's a bad thing to happen or you can also trade it to other stable coins. It depends on you just don't sell your altcoins all at once.
selling at this point is not a bad choice, holding too much will cause you idle investment so with this kind of market right now it depends on the analysis and perspective of the trader. There are people selling during 600 to 700 eth but right now they can buy a lot since it is much cheaper, who knows 460 is not the deepest price we could have this year in terms of ethereum's price.