Cryptyo coins work like any other kind of money (not backed by gold), it only has value because people think it does. When GPU mining was new and gaining attention, it was peoples own FOMO that drove the price up so high until the market collectively realized crypto is just like anything other currency in terms of how it's valued. It gained a lot of attention because it was new, it has certain benefits over real money like not being controlled by a government, and because people figured out they could more or less literally start printing their own money. Long term, cryptos only real power is to simply exist as an alternative to government controlled money. That's it's only real value and going forward there is no more or less reason to invest in crypto vs investing in the stock market.
One of the biggest reasons crypto got so high is because young people can understand it a lot better than they understand the stock market, and it's a lot easier to get started with crypto than stocks. Once the FOMO wore off things came back down to reality and there will never be another FOMO rush on crypto.
i7 7700kK @4.2ghz
16GB DDR4 3200mhz
GeForce 1080 Ti