According to Cas Abbé, traders should be cautious of a potential market top when Coinbase becomes the top app in the App Store, 'Cheapest Crypto' searches hit record highs, and major celebrities launch memecoin projects. Additionally, a Bitcoin MVRV ratio exceeding 3.5 is a critical indicator of market peaks, signaling potential overvaluation. Each of these indicators has historically preceded significant market corrections, suggesting traders should evaluate their positions when such conditions arise.