I joined an ico in january 2018 and it was a bad ico. The price of this ico is 1/6 of the ico price and i lost about 3000$ if i sell now. Someone can tell me what should i do? Sell or countinue Holding? 
you should sell your coins, accept your loss, move on to the next ICO. The longer you hold the bad coin, the more money you might lose. Instead of holding, you can sell them and buy other coins which are more promising than your previous coin. The bad coin can be saved by investors. But bad ICO coin can never be saved. I have a few suggestions for you if you want to follow my portfolio: ethereum, NEO, litecoin and digibyte. And if you do not want to involve in any altcoin, bitcoin is still the best fellow to anyone want to earn money from the cryptocurrency