Hi,
I've recently graduated from 4G to kinda fibre (we moved into an apartment and got connected freedom which is fibre into the building and Ethernet throughout the building) and the router that came with and is locked down by the ISP isn't great.
I have a Smart Modem 2 from skinny that is a better router if I knew how to unlock/configure not to connect to 4g and configure to repeat the wifi signal.
The apartment is over two levels and the smart modem has a much better wifi radio which is just as strong upstairs as down.