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.
I see this happen a lot, you see creators call for support for their coin and they barely get any but when the coin fails you see everyone blaming the creators like they do not know that for a coin to do well then it needs a great deal of support and demand. When there is not enough support for a coin then there is nothing that is going to stop it from failing