Cox techs can't do anything about this. They need to replace the nodes they are aware of being overloaded.
The best thing you can do is file FCC complaints which will make them actually do something about it. I've had problems since before covid and they are trying to blame covid for the issues.
The troubleshooting thread "Tiffany" will come link is just a time waste at this point.
It's even worse than a "waste of time". Part of it is even counterproductive and hurts Cox and its customers. A major culprit in many of the complaints is the lack of upstream capacity on the node to meet the subscriber needs. By asking everyone with issues to run a speed test, they end up putting additional burdens on the very limited shared upstream node bandwidth capacity.
