Options for dead spot using AT&T wireless router

Options

We have AT&T's wireless modem/router combination with 300 gig AT&T Fiber as shown below.


We also have a smaller older home with plaster walls. In a few of the rooms furthest from the router, we have week internet signal which is resulting in issues since one of these corners is where my wife has her office. I'm looking for advice on what we should be looking into to solve the problem. My first thought is to use my own router and just buy something that pipes out a stronger signal and hook that up to the router. However I also have heard that something like a google mesh system may be what I need. Does anyone know if google mesh even works with an AT&T router? Has anyone had any success with a similar setup?

Answers

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