The price of cryptocurrencies basically follows the rules of demand and supply. As the coin becomes scares it becomes more valuable and hence the price increases. One common mistake most investors do is that, once they see the price of a coin is going down, they hastily dump what they also holding which increases the supply more than the demand and further reduces the value of that particular coin. Later we try to put the blame on the team that they are not managing the project well. Let's help sustain our coins by avoiding panic selling. Its a collaborative effort.
You cant really determine the price of any coin you are holding, but some people can move the price to any direction they want; whether up or down, and thats what we call pump and dump but I am not in support of such things cause its a way whales usually use to steal from the community and it is very bad, I will also not encourage anyone to do the same. Let just do this the normal and invest when we want without the intentions of pumping and dumping.