Currently I own a lot of altcoin, I bought them at ico. My account is being downgraded several times. There are many people who say bitcoin will continue to decrease, so altcoin prices also decreased compared to USDT. So now, should I sell them and wait for the price to buy back? Give me advice 
Many tokens return to the original ICO price after a while. Maybe it makes sense to wait. Of course, I'm talking about quality projects that really do something.