This is due to the fact that the Ethereum blockchain is starting to use fewer projects every day. Organizers are moving to more popular products such as Binance. Vitalik buterin stopped paying due attention to his project. In addition, in the near future it is planned to update Ethereum 2.0 and until then the price of this cryptocurrency will not grow.
They are working with their coin and that is why they come up to an update next year, Vitalik is still with ETH and it will still grow for sure. BNB made a good strategy on beating ICO but Im sure ETH wont stop here, it will still go up and fly high. New ATH will be made soon, just hold and hold more.