Jeff has an older Acer AC1900 router. Now he's looking at a mesh router. Leo says mesh routers are great for larger spaces, and he can add three satellite units, which could cover 1500 square feet. It provides multiple access points because the Wi-Fi is "meshed" throughout the house. Eero even works with Echo and he could assign devices to users and then have Echo pause the internet access for them. Eero also has great parental controls. It's not cheap, though, but he can get two for about $200 though, and that should be enough.
(Disclaimer: Eero is a sponsor)