Greetings friend @tomlee.
You're right. Countries need a diversified economy.
For this, governments should invest resources annually in the exploration of the territory in search of new sources of renewable natural resources. Knowing the wealth that each nation has is vital.
Then they would have to train their population to take advantage of these resources. For this they must invest in education and prepare the replacement generations.
Everything represents a study and projection of well-structured action plans.
Great job. Thanks for sharing.
Your friend, Juan.