Extremely High Ping While Online Gaming

Hi! I've been having high ping in video games for a while now. It was really good when we first switched to Xfinity from AT&T but after a few months it started getting worse and worse. I spoke to an agent and they did some tests and gave me steps to troubleshoot. We had a tech come and the issue still persists. I'm getting upwards of 70 ping on California Servers which pales in comparison to the 15-20 I was getting in the beginning.

I play professionally and this has been an ongoing annoyance. I've already tried many troubleshooting steps, but have had no success.