Extreme Latency Issues North Lauderdale

A few weeks ago (around March 19-24), Xfinity advised that they will be doing "maintenance" to our internet and we may experience an outage for a few days. They set the expectation on when the service would come back which was little more than a few days as I stated in the dates previously, but I was cool with that. The internet came back some time that weekend and from then, It has not been the same. I game mostly every day (Mainly First Person shooters like Call of Duty etc.), and my first time getting back on I was experiencing severe latency issues. My "Ping" in game would literally spike to 190ms sometimes, and isn't what It usually is anymore, which Is usually around 40 or lower. It's almost like my internet is being throttled around a certain time of the day. After doing speed tests at random times throughout the day, I came to the observation that my internet goes downhill around 7P.M. all the way until about 1A.M. Basically the only times that I can use my internet is either early in the morning, midday, or late at night. Is this an issue on Xfinity's end? Are there too many people in the area using the internet which is causing this issue?

Sending this message now almost a month later (4/15), and I am still having this issue which is really unacceptable, being that I'm paying for Gigabit internet and should be getting 800-900 Mpbs at any time of the day. I'm really searching for answers from someone with experience, possibly a technician, not a customer service agent that only has customer service experience (No offense). I also want to know if anyone else in my area is also experiencing this issue, or if it is only me. I've reset my Xfinity XB7 router multiple times by sending reset signals through the app, doing a physical reset, etc. I've port forwarded all my games, disconnected any additional devices in my home that may be affecting it. The whole 9.