According to Michaël van de Poppe, traders should manage their expectations regarding their cryptocurrency portfolios. He emphasizes that expecting a 100x return in 6 months is unrealistic, while aiming to outperform Bitcoin with altcoins over a 3-year period might be more feasible. Van de Poppe suggests focusing on long-term strategies rather than short-term gains to mitigate fear and anger in trading. This perspective is crucial for traders seeking to make informed decisions in the volatile crypto market.