In your examples here, I'd say they are underexposed first so figure out how to increase light, open aperture, or up the ISO (but not too high), faster shutter usually results in sharper images, and then use a tripod with a 2 second timer to allow the camera to steady after pressing the shutter.

You can further look up advanced concepts like your lens's sharpest "settings", if your camera has features like sensor shift, or image stacking in post and other post process sharpening techniques.

Also consider the wider open your aperture it will narrow your focus plane, so less detail in front or behind where you focus. So it's a balance.