You can examine the low-pressure pipe well of your building, can you enter your garage there, if you can, you can use it to go through the past, can not wear it, can only walk along the wall, from the appropriate position of your home to play through the wall hole, after the network cable comes out, along the wall to the direction of the garage, and then into the household (into the garage), where the network cable passes, try to nail the cable clamp, Use network cable pliers when making RJ45 connectors. It's going to be tough anyway. If you're interested in doing something, try it yourself.
Put a wireless router on the line, and if the signal is not enough and install a signal amplifier in the garage, the computer market will know