We have been busy doing other things more interesting (subjective) and useful toward improving human quality of life than walking on the moon again.
The moon is a bit of a luxury. We're going back because it has gotten a lot cheaper to do so (and China is going for it soon, which spurred the US to go back before China gets there). The sole reason the US is more recently in such a hurry to go back is because of China's progress.
There is very little value in merely going back and walking around again. The only good reason to go back is to begin building a long-term settlement/base of some manner, and we couldn't afford to hope to attempt it until recently. Starship is the only thing that can make that economically viable this decade.
The moon is a bit of a luxury. We're going back because it has gotten a lot cheaper to do so (and China is going for it soon, which spurred the US to go back before China gets there). The sole reason the US is more recently in such a hurry to go back is because of China's progress.
There is very little value in merely going back and walking around again. The only good reason to go back is to begin building a long-term settlement/base of some manner, and we couldn't afford to hope to attempt it until recently. Starship is the only thing that can make that economically viable this decade.