How to bridge AT&T Fiber Internet with Netgear AC 2300

I have AT&T Fiber 1000mbps for my small business that I run at my home. I have VOIP 5 office computers and all my families devices running on this WiFi. AT&T provided me with a Arris BGW210 DSL router. I have my all my office equipment directly wired into the router and I still get a speed at best of 180 mbps. Everything else in my house struggles getting an internet connection. After trying boosters provided by AT&T and having several technicians come to the house with zero results. I decided to buy my own router (Netgear AC2300) to try and speed up my download and upload speed. Unfortunately I’ve found out that unless it’s AT&T issued equipment it will not work unless I bridge my Arris BTW210 to my Netgear AC 2300. Is this true? And if so how do I go about doing this? If not true what can I do to get the Internet I’m paying for?