High Ping and Packet loss in Seattle Area

For about 3 months now I have been getting unbelievable packet loss and high ping. This wasn’t an issue before the quarantine so I’m wondering if Comcast has decided to throttle internet. I pay for 1GB service so the fact that I can’t even play any online games with getting 150-1000ms ping is ridiculous. I’ve tried new coax cables, Ethernet cables, had a tech come out and tell me I’m crazy because everything tests fine. Download and upload speeds work fine on speedtest. The issue is that any kind of activity that requires a lot of data (like gaming) immediately renders the internet useless. I’d switch ISPs if I could. What else can I try and is anyone else having these issues?