The cryptocurrency was never gone in the first place, I think it’s doing number’s and has stayed for over a decade now. Cryptocurrencies are an ongoing technology and socioeconomic experiment.
As a start, your title took me by surprise but then your write-up was different. However, cryptocurrencies has never gone anywhere nor are they going anywhere, they have come to stay with us and will only but continue growing each day. Also, there are cryptocurrencies which have gone and might not return again and these cryptocurrencies are termed "shitcoins" because they have nothing to offer. Lastly, the knowledge of the crypto space and as such blockchain is what will keep attracting users because the blockchain technology itself is now gaining massive attention owing to its reliable and efficient nature.