I am looking to improve my home network to remove a WiFi dead zone.
Basically I have the internet provider supplied modem, with built in Wifi5.
This feed a Powerline adaptor with a wireless access point that goes to the bedroom/office area of the house. All works fine here.

Attached to the modem/router is a network cable that feeds the man cave, into a network switch, which feeds my devices with other network cables, and another wireless access point. All works fine except the guest bedroom, which is upstairs. This is not far from the modem with a built in router, but there is a relatively thick wall between the two.

So, I am thinking of either investing is a WiFi nest system (3 nodes) to remove the power line adapters, or to simply add a WiFi 6 router to my modem, and turn the WiFi 5 transmission off, which seems cheaper, and easier.

Does anybody have any idea about what would be the best solution?