People most oftentimes sells for fear of missing out, this will ultimately depends on the cryptocurrency we are dealing with, sometimes it more better to sell to hold and regain our asset value back by reinvestment all because we want to avoid long term loss, when the market is falling, we can choose to covert to usdt and later buy the dip again and hold, but when its an investment on a low valued cryptocurrency, we must sell at loss that the market may not rise again, Luna is a good example.