We had different priorities because we realized going to the moon is mostly useless. NASA almost forgot to accomplish their original mission with Apollo, putting a scientist on the moon. They sent Dr Harrison Schmitt at the absolute last minute with the Apollo 17.
Post-Apollo it was realized NASA was a cute way to subsidize the defense industry and keep a large volume of people working and educated about building and maintaining rocket systems. Notably the Space shuttle required both liquid fueled and solid fueled rockets, ensuring a diversity of knowledge and skill in multiple domains. Conveniently the only practical difference between orbital manned spaceflight and suborbital weapon systems is the trajectory.
It is now politically expedient to support further manned missions as a spectacle to distract the US from real problems.