What is the reason for NASA being so famous

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What is the reason for NASA being so famous?

NASA and Roscosmos are two space agencies that forced the world to look at space. NASA was established in 1958 and since then NASA has done many astounding works, one of which was Moon Mission and the second Voyager Mission was very famous. It would not be wrong to say that NASA is the largest contributor to what we know about space today.

Why did America's NASA never send humans to the moon again?

According to me, there is no need for NASA to send humans to the moon.
Actually, it is risky and now nothing will be achieved by sending humans to the moon. Because
There should be a big objective to send humans to the moon which is not there yet, unmanned missions do all the work, there is no risk of life, robots can work for a long time, need to bring it back It does not even happen and is cheap.