Same. I found that my neighbours were swamping my signal in the outer rooms of my (small) flat and did the booster thing, a couple of ethernet-over-power wifi routers: TP-Link TL-WPA8631Ps
https://www.tp-link.com/uk/home-networking/powerline/tl-wpa8...
They were a breeze to set up, pushbutton if you just want to use the same SSID/password as your ISP router. I have this set up to serve the 5GHz on a different SSID tho - that stops my laptop switching to 2.4 and terrible performance. I'd have done this on the ISP's router (a BT homehub) and just pushed the buttons, but since a recent firmware update, the homehub goes into a crashloop if you try this.