Severe Packet Loss (Upload)

Hello, I have been a Cox Customer for 17 years and a few years ago I started having very bad packet loss issues. I have spent hundreds of hours trying to fix this issue but it still happens even years later. I am only receiving packet loss (upload), 0% download packet loss. I am receiving low ping (for the most part) (30-40ms) and high packet loss (10-120%) in games such as Fortnite, Overwatch, Rocket league and more. It is happening on my PC & PS4. Here is a list of stuff I tried to fix the issue -

- Replaced router twice

- Replaced modem

- Plugged directly in through Ethernet, getting perfect speeds (100/10)

- 2 Cox Techs came out and replaced my line but nothing changed. Tested, and said I had 0% packet loss but I am still receiving it?

- Called cox multiple times and no help was provided.

- Done a lot of online research, and tried changing in-game settings to help it but nothing changed. Only thing that slightly helps is if I set my FPS to 30, but I can't play with that considering I use a 144hz monitor.

This is 100% a Cox issue as I used a TMobile hotspot and received 0% packet loss so it can't be anything on my end.

Please help, I don't know what else to do! Thank you!