From a long-term investment perspective, the cyclical nature of the crypto market offers key portfolio guidance:  
1. **Dollar-Cost Averaging (DCA)**: Deploy capital incrementally across cycles to avoid timing volatility. Accumulate during bear markets (e.g., 2022-2023) when assets are undervalued.  
2. **Cycle-Aligned Allocation**: Shift allocations toward **high-beta assets** (e.g., altcoins, DeFi tokens) in bull phases and **low-volatility holdings** (e.g., Bitcoin, stablecoins) during bear markets to preserve capital.  
3. **Rebalancing Discipline**: Regularly rebalance (e.g., quarterly) to maintain target allocations. Trim gains from outperforming assets (e.g., 2021 NFT boom) and reinvest in underperforming but fundamentally strong sectors (e.g., layer-1 blockchains).