So what would we do? Prepare to sell all altcoins to make a big dumping or continues hold? you say what we have known, but if we invest we must accept to lose.
What you must do is to take precautions, the market of icos is in the worst shape in years and it is not going to recover, if making money in it was hard now is going to get harder, so if I were you I will avoid them since the chances you make money are very small, if you are going to make any investment then you need to invest in bitcoin or in good altcoins.