Thrift store and check if router can support dd-wrt. Get dd-wrt on router, setup to connect to WiFi to 5ghz if your phone is able to get 5ghz where you’re at.

Configure dd-wrt router to connect to your WiFi as client bridge mode.

👌 was an easy $25 thrift store router find, then you’d have 3 extra ports for other devices and a repeater too if needed.