It's really hard to predict. 2017 with ICO followed by IEO, DeFi, IDO, NFT. Currently, DeFi and NFT are still very hot; and will continue to exist. I think next could be Web 3 . We can only wait and see what the next trend is.
ICO(Initial Coin Offering), IEO (Initial exchange offering )and IDO (Initial Dex Offering) are similar markets where the projects are trying to sell their coins but DeFi or Decentralized finance is a different aspect altogether which can be used for many different aspects if they are taken seriously and so is the case with A non-fungible token (NFT) where you can digitize anything in the market and make your unique product with the help of blockchain.
These are hyped up products in the market and in the future there are many aspects that can be done using blockchain.
And surprisingly ICO is still alive even upto now which i cant really believe that there are still investors who are willing on investing into projects which are mostly scams.