1. The state increases the purchase of gold and silver: the state can increase its possession by increasing the purchase of gold and silver. This requires the state to have enough budget to buy gold and silver.

2. The state increases the output of gold and silver: the state can increase its possession by increasing the output of gold and silver. This requires the state to have sufficient gold and silver mineral resources and technical support.

3. The state buys gold and silver from the international market: the state can buy gold and silver from the international market to increase its possession. This requires the country to have sufficient foreign exchange reserves and purchasing power.

4. The state encourages people to buy gold and silver through policies: The state can increase the domestic gold and silver holdings by encouraging people to buy gold and silver through policies. For example, the state can reduce the import tariff of gold and silver or increase the consumption tax of gold and silver to encourage people to buy gold and silver.