Choosing Forex pairs for long-term investment requires a careful consideration of a variety of factors. Here are some key things to consider:

Economic fundamentals: The economic fundamentals of a country can provide valuable insight into the future performance of its currency. Economic indicators such as interest rates, GDP growth, inflation, and political stability can all affect the value of a currency in the long run. For example, if a country has a strong and stable economy with low inflation, it is likely that its currency will appreciate over time. On the other hand, if a country has high inflation, political instability or weak economic growth, its currency may depreciate over time.

Geopolitical risk: Political instability, terrorism, wars, and natural disasters can all increase the level of risk in a currency pair. When geopolitical tensions arise, traders and investors may avoid currencies that are most affected by these events. For instance, if a country experiences a terrorist attack or civil unrest, investors may avoid its currency in favor of more stable currencies.

Currency correlation: The correlation between currency pairs refers to how closely they move together. By diversifying your portfolio with currency pairs that have low correlation, you can reduce your overall risk. For example, if you invest in both the EUR/USD and the USD/JPY pairs, which are often negatively correlated, you may be able to reduce your risk.

Technical analysis: Technical analysis is the study of price movements and market behavior. While long-term investments are generally less influenced by technical analysis than short-term trades, it's still important to consider charts and other technical indicators to identify long-term trends and potential entry and exit points. This can help you to determine whether a currency pair is likely to appreciate or depreciate over the long term.

Risk management: Managing your risk is crucial when investing in Forex. You should always have a clear understanding of your risk tolerance and set appropriate stop-loss orders to limit potential losses. Additionally, diversifying your portfolio across different currency pairs can help to spread your risk.

In summary, choosing Forex pairs for long-term investment requires a thorough analysis of economic fundamentals, geopolitical risks, currency correlation, technical analysis, and risk management. By taking a disciplined approach and staying informed, you can increase your chances of success over the long term.