Go with something like an orbi that lets you put multiple satellites around the house. Or if you’re tech savvy go with a ubiquiti setup
Home Automation
Home automation is the residential extension of building automation.
It is automation of the home, housework or household activity.
Home automation may include centralized control of lighting, HVAC (heating, ventilation and air conditioning), appliances, security locks of gates and doors and other systems, to provide improved convenience, comfort, energy efficiency and security.
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If it is an older house, it may not be too difficult to run Ethernet cable either below the floor or above the ceiling to a more central location. Then you could either 1) add a more capable wifi router (and turn off the Xfinity wifi), or 2) add another access point at the new location to provide a better wifi coverage.
Very old homes, sometimes have lots of plaster in the walls and that is problematic for wifi penetration.
First: Get that piece of shit gateway out of your house and get an actual legit Wi-Fi system. Second: Get a mesh Wi-Fi system! Third: Get a separate modem. This is optional, but getting a mesh Wi-Fi system is not unless you want to have to constantly worry about having to reboot your router. If you really want to stay with Xfinity products, look at their XFy pods.
A lot of this will depend on who is going to maintain this. Because there is cheap, fast and easy, but you can only pick two... I will tell you that what you have no is the cheapest crap they think they can get away with. The best way to do this is with a cable modem alone, a solid router with no WiFi, and WiFi access points wired throughout your house. But this is also more complex to manage. The easy way is an Orbi like system where you get an ecosystem based on mesh networking. This will slow you down, add latency, and can be a bear to troubleshoot when something goes wrong.
But the question is what are you willing and able to do?