An analyst explains how a retest of a major on-chain support zone could trigger a crash in Ethereum to $1,800.Ethereum is currently retesting the $2,292 to $2,359 range, where a significant amount of ETH was acquired by investors.If the demand zone breaks, the analyst predicts a sell-off that could drive Ethereum towards $1,800, resulting in a 21% crash.The future of Ethereum's price and whether the on-chain support zone will hold remains uncertain.