How to fix blurry textures in Age of Empires II at 4K resolution?

In 4K mode, metal textures looked blurry during turns. I tried switching DLSS to Balanced mode, but it made the blurriness worse. I used GamePP DLSS/FSR Image Sampling Calibrator to raise sharpening to 75. GPU-Z showed the clock stable at 2610MHz, and RivaTuner confirmed sharp details. The switch to high-intensity sharpening restored the visual clarity I needed.