What mistaken belief did the Count-Duke of Olivares hold that brought disaster to Spain?

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The Count-Duke of Olivares believed that Spain must return to the imperial tradition of the sixteenth century in order to solve its economic and political difficulties. He believed that the solution to Spain's problems was to expand the empire and conquer new territories, which would bring new sources of wealth and power. However, this strategy proved to be a disaster, as it drained the royal treasury and weakened Spain's military and economic power. The wars of the seventeenth century, including the Thirty Years' War and the war with France, were costly and resulted in significant losses for Spain. As a result, Spain went into decline and lost its status as a great power.

What Mistaken Belief Did the Count-Duke of Olivares Hold That