High-resolution camera - Obviously the highest quality camera that you can get your hands on is going to take the best quality photos. Mirrorless cameras are all the rage these days, and there is a wide range of suitable cameras that can improve your astrophotography and moon photography. As well as larger image sensors and resulting in better imaging and low noise performance, mirrorless cameras feature manual adjustments for getting the best moon image every time and compatibility with suitable telephoto lenses.
Using a mirrorless camera with very high resolution is also excellent for cropping the image later on for a closer moon photo, without the image degrading in quality.
Telephoto lens - We don't need to tell you that the moon is very far away. While your standard zoom lens or wide-angle lens can capture a photo with the moon in it, it will be rendered as just an element of your composition and not the main subject. To achieve this you need a much tighter crop, which is provided by using a telephoto lens. These high-magnification lenses also make it possible to capture some of the details of the moon's surface, for a far more impactful image.
Basically, you want as much reach as you can harness, so purchase or rent a long telephoto prime or zoom lens, consider adding a teleconverter for increased magnification, and crop to your advantage (see above).