Boost your Wi-Fi easily by purchasing a range extender. A range extender is like a second, smaller router plugged into the wall in another room.
Range extenders are priced anywhere from 50 to 300 dollars. TheWirecutter, a tech review site, recommends the Netgear EX6200. This extender is about $100, and TheWirecutter has done lots of reviews and tests to have chosen it as the best. The Netgear extender is meant to extend your existing Wi-Fi network in your house or workplace. It works well in very large homes and even reaches into backyards, and eliminates "dead zones" inside your house.