Leave the market after the value has falls 50% seems to be the wrong decision, so it's better to keep holding it. Unless you are very confident if the market conditions will continue to get worse until the end of the year, maybe leave the market from now on is the best decision.
yes you are right, if we have an altcoin bought when the price is still high. it was a wrong decision. but for those who have already made a profit or are not trading, it is better to leave the market and not buy any altcoins first. before the market improves.