Here’s a little context of the setup:

My router+modem is on the first floor of the house, and it works great for that floor, but in my media/office room in the second floor, the wifi connection is quite spotty. I have routed an Ethernet cable from the first floor to my office room so that my PC gets direct Ethernet access, but this obviously doesn’t help with the wifi for my phone, TV and other devices. The question then becomes, should I use a powerline adapter or should I just use the already routed ethernet cable, buy a network switch/splitter, and then hook a new router from the ethernet cable? And if I do it this way with the new router how will the setup work, will there be a new SSID/wifi-endpoint, or will it just use the old one and “enhance” the signal of that?

Internet speed is 750/500.

Appreciate all input :)