Why did Tokugawa Ieyasu abandon Toyotomi Hideyoshi's continental strategy?

Toyotomi Hideyoshi has just finished the troubled times of the Warring States, and has little self-cultivation at home. Was it invincible when it launched a war of aggression?

Tokugawa Ieyasu hasn't seen that at the beginning of the world, people's hearts are still unstable. After 200 years of war, the people long for peace; Famous people with surnames continue the old ideas and powerful people are in charge of the world. At that time, Tokugawa Ieyasu was almost 70 years old, and it was inevitable that no one wanted to take advantage of his death to win the world. Therefore, for the sake of the Tokugawa shogunate behind him, Tokugawa Ieyasu educated the people with Confucianism, which naturally would not continue the mainland strategy.