In my apartment the DSL modem/router has to be in the kitchen because that’s where the only telephone jack in the entire unit is. The router has wi-fi capabilities. I currently have a 50-foot ...

If AT&T can’t provide an upgrade, you can use your own, faster Wi-Fi 6 or 6E router with your existing modem. At my home, I have AT&T Fiber 1000 service running through a modem with Wi-Fi 5.