When investing in the cryptocurrency world, you can consider the following robust investment strategies:

1. **Fixed Investment Strategy**:

- Choose a fixed time period (such as weekly or monthly) to purchase a fixed amount of cryptocurrency, regardless of price fluctuations. This strategy is called the average cost method, which aims to spread the purchase cost over the long term and reduce the impact of market fluctuations.

2. **Core-Satellite Strategy**:

- Divide assets into two parts, one part is invested in stable and mature core assets (such as Bitcoin and Ethereum), and the other part is invested in satellite assets with high growth potential (such as emerging altcoins). This can control risks while pursuing high returns.

3. **Base Position Strategy**:

- Set up a certain proportion (such as 10% of total assets) as a base position for long-term holding, and do not trade easily. This helps to establish a currency-based mindset and provide a basis for subsequent operations.

4. **Mean Reversion Strategy**:

- Reverse operations when the market is extremely volatile, that is, sell when overbought and buy when oversold, based on the theory that the market will return to the long-term mean.

5. **Stop-loss and stop-profit strategy**:

- Set the buying and selling price points in advance to protect the principal and lock in profits, avoiding irrational decisions caused by greed or fear.

6. **Policy-sensitive strategy**:

- Pay close attention to global policy developments, especially regulatory policies on cryptocurrencies, and adjust the investment portfolio in a timely manner to avoid risks.

7. **Diversified investment**:

- Do not concentrate all funds on a single cryptocurrency, and diversify risks by investing in multiple assets.

8. **Long-term holding (HODL strategy)**:

- For investors who believe in the long-term value growth of cryptocurrencies, they can choose to buy and hold for a long time, ignoring short-term fluctuations.

Each strategy has its applicable scenarios and risks. It is important to choose the right method based on personal risk tolerance, market understanding, and investment goals. At the same time, continuous learning of market dynamics, project analysis, and technical analysis is the key to improving investment results.