Why didn't the Western Han Dynasty go to Central Asia?

I'll tell you why Chinese people rarely invade and occupy other countries' territories in history! Because, China people simply look down on you wild races! You got it? They don't want you at all, there is no interest without demand! Without interests, there will be no disputes! Therefore, it is for this reason that China people rarely invade other countries in history! When Confucianism occupied China, it opened people's wisdom and made China people feel superior! There is a sense of pride in the bones that other nationalities do not have! They will not obey the rule of barbarians! However, I know that barbarians are difficult to tame! Taking them in is a very troublesome thing! So! I never thought about expanding my own territory and grabbing other people's territory! Because the Han nationality is a society dominated by agriculture and farming! They can be self-sufficient, and you won't invade others and plunder anything! In the history of China, so many ethnic minorities admire the culture of the Han nationality and are willing to enter the territory of the Han nationality. With the deepening of communication, they are slowly sinicized! So, this is how China's territorial expansion is carried out! Slowly, after separation and integration, 56 ethnic groups gradually stabilized! Even though China has declined, they will still support the return once they have the ability to recover lost ground! Even if other nations succeed for a while, they will not last long! Right?