It would help to know more about your home, including the materials and composition of the walls and the general layout. WiFi, powerline and MoCa all failing to

It would help to know more about your home, including the materials and composition of the walls and the general layout. WiFi, powerline and MoCa all failing to perform suggests pathological levels of interference or a problem with your computers. Have you tried stringing a long cat 6 patch cable from one room to the other, just for the sake of experimentation?