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 
if you already make a profit on the altcoin you bought better to sell it dont wait for much bigger profit like what happened.to me i waited for much bigger profit and in the end i lost. This is old thread which created in 2018. it means more than 1 years from now.
Im sure that coin which OP bought, already down as fu**
it is a good things to learn that we dont have to hold coin (especially shitcoin) for long term
bcz it is very dangerous, thanks.