Value preservation refers to maintaining the value of an asset from loss or reduction within a specific period of time. For the problem of preserving the value of $100 million, here are several possible strategies:

1. Investment diversification: By diversifying $100 million into different asset classes, such as stocks, bonds, real estate, and commodities etc., which can reduce investment risks. Doing so provides greater opportunities to increase the value of the asset and reduces the impact of volatility in a particular market on the overall portfolio.

2. Long-term investments: Holding high-quality long-term investments can increase the value of your assets. Long-term investing is generally more stable than short-term speculation because market fluctuations are likely to balance out over the long term.

3. Risk management: Ensure a clear understanding of investment risks and take appropriate risk management measures, such as stop-loss orders, diversified investment portfolios and effective asset allocation.

4. Seek professional advice: The right financial professional can provide customized investment advice and develop an appropriate investment strategy based on your risk tolerance and investment goals.

In addition, there are other financial instruments and strategies that can help preserve value, such as futures contracts, options contracts, hedge funds, etc. However, these tools also carry certain risks and need to be used after full understanding and evaluation.

It is important to understand that financial markets are complex and full of risk, and risk cannot be completely eliminated. Therefore, no matter what strategy is adopted, it is necessary to pay close attention to market dynamics, adjust the investment portfolio in a timely manner and evaluate whether the measures taken are in line with the expected goals. Most importantly, choosing a suitable hedging strategy needs to be based on your personal circumstances, investment objectives and risk appetite.