According to @EmberCN, a trader has effectively increased their Ethereum (ETH) holdings from 3,586 to 5,515 ETH through a series of strategic buy and sell actions. Initially, on May 21, the trader sold 3,586 ETH at $3,667 per ETH, receiving $13.15 million. Subsequently, the trader bought back 5,236 ETH at $2,512 per ETH using the same $13.15 million. Recently, the trader purchased another 5,093 ETH for $12.11 million, continuing their strategy.