Extenders are not ideal, as transfer rates can also be lost. To get better WiFi at home, a WLAN mesh system is much better suited. A mesh router is connected to the existing modem or router with a LAN cable and the WLAN is then switched off. The mesh WiFi routers take over the entire home network traffic. As a very good solution, and even cheaper, I would recommend the mesh router from Xiaomi, the set consists of two powerful WiFi 6 mesh routers. Each has a built-in 3 port GBit switch, where you can also connect additional devices with a LAN cable.
Xiaomi AX3000