According to Cas Abbé, traders should consider taking significant profits in ETH only after a new all-time high is reached. The primary profit-taking zone is at $5,400 to $5,600, which represents a 10% increase above ETH's previous ATH. Abbé notes that ETH's price action is expected to mirror BTC's 2024-25 run, highlighting the importance of monitoring historical BTC movements for ETH trading strategies. This level serves as a crucial resistance and potential exit point for traders, supporting a disciplined approach to capitalizing on ETH's upward momentum (source: Cas Abbé).