Thank you all so much for your help. I have an external wireless card on my PC that came with the motherboard. In the manual, it's listed as 3x3 Asus 3t3r and it's connected to the motherboard with three wires. I can't find any other information on it. Here's a picture...
I'm using the Netgear CM1000 modem and Asus RT AC68P router. I just upgraded the plan today from 250 mpbs to 1 gbps on Xfinity. I reset everything on the router and just bought the modem today as an upgrade. I ran through all of the setup on the xfinity website and also ran the troubleshooter...