There is a secret crypto club. They say what to buy and what gains you are likely to make. Insider info somehow. I don't know what it is based on.
There are Telegram based groups that give signals on what to Buy and when to Sell but their operations is suspicious and for me its not to serve their members but to serve themselves by Buying early and give signals to their members to Buy and that pumps the price further then the operator will start dumping. I don't recommend joining those groups.
Other than that, there are whales and they have a lot of money to spend, that money can be their personal money or money pooled from different sources and they have enough funds manipulate the price of a coin to make it look like theres a demand so other traders will Buy, then whales will start Selling or dumping.