Trader Eugene Ng Ah Sio shares a recent trading summary, revealing his significant losses while going long on SOL. After making a profit on BTC, Eugene turned to long positions on SOL and its ecosystem, originally setting a moderate risk-reward ratio. However, the SOL price failed to rise as expected, and Eugene did not cut losses in time, increasing his position when SOL dropped to $200, ultimately leading to a loss of $6.2 million, about 10.2% of his total account. He reflects that the key mistakes leading to the loss were the failure to decisively cut losses and excessive position sizing. Fortunately, he eventually succeeded in recovering the losses through a series of profitable trades and concluded the importance of avoiding sunk cost thinking.