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many people are lying. Some because they are developpers of coins and want you to keep the coin to hold as much value as possible. Some because they are paid by developpers. Some because they want you to buy coins so that they can sell with the most profit o return money possible. Bulls will want you to buy more and hold more. Bears will tell you to sell if they havent got coins, and hold and buy if they already bought them, so that price goes up and they sell with little profit. Then, another time will tell you to sell to drop another time the price.

No matter how hard this guys lie. You can do your own research. never ever have cryptocurrencies gone through what is happening right now. The major deeps in the past where because of technological issues, hacking, very low quality projects, or massive sells due to massive profit.
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Now, my advice? i know the market will not recover in probably a year. i'm not talking about full recover. i'm talking about stable market. If you don't need that money, you can play a risky game and wish all will go well. my best advice, considering all, is to sell and do it fast.