New internet plan, very slow speeds

I just activated my plan 800 Mbps. A technician did come out and made sure the cables outside the building were connected (they were not). 

I have the following equipment - should be plenty sufficient for the plan. Currently, I only see around 189 Mbps based on speedtest.net results and this is at 11pm local time. Any recommendations on how to fix this? Already tried restarting modem, router, and PC. Modem is connected using Xfinity-provided coaxial cable. Also, spent an hour with chat and they were unable to resolve this.