The BEST WAY? Run an Ethernet cable from your main router’s lan port to a simple unmanaged network switch, then run a cable from the switch to the basement, to a new router. Name the router the same SSID(wifi name) as the main router, same password. Wired mesh done. Router models don’t usually need to be the same.

Honestly you’re better off getting a non-wireless router and switch with sfp+ ports and back hauling them with 10gb transceivers, then just get a wifi6e AP. Microtik makes a real nice set of switches with dual sfp+ and multiple 2.5gbe ports.

Negotiating 5 gigabits was widely skipped to 10gb, which has more support than even 2.5gb.

Or skip learning what that all means and just get a wifi6e router with a 2.5gbe wan.