A stable cryptocurrency investment strategy should be centered around 'long-term holding and diversified allocation'. Choosing cryptocurrencies with large market capitalization, wide application, and historical stability, such as Bitcoin (BTC) and Ethereum (ETH), can reduce risk. It is advised to invest a fixed amount regularly each month, unaffected by short-term fluctuations, to avoid emotional trading. At the same time, a portion can be allocated to stablecoins (like USDC) to cope with market volatility or to serve as a hedge. Remember to avoid heavily investing in small coins or high-leverage operations, and consider an asset allocation of 70% mainstream coins, 20% stablecoins, and 10% innovative coins. Prioritizing cybersecurity and using cold wallets to store assets is also a part of a sound strategy.