Nouriel Roubini said that the decline of Ethereum was triggered by a few active decentralization applications (DApps)
and the result is 80% ETH drop and fall, DApps is crypto kitties, scammy, ponzi pyramid, and casino games. so the cryptocurrency has lost its value.
Ethereum already has several scalability problems. for years. people used to think that the ETH could seriously compete with BTC, but remained outside of all the flipping that occurred.
I can say ethereum was damaged by his own followers. too many people suffer losses due to Ponzi schemes, gambling, and the like that use the eth platform. therefore ethereum may have to make a new innovation to restore users' trust in their platform