Ridiculously Slow Upload Speeds

I am experiencing the exact same thing.  My plan advertises a 10 Mbps upload speed (ultimate 500 or whatever) and I might get 8Mbps on a good day but frequently much less than that.  My speed test from this afternoon after frequent disconnects was at 500 kbps (angryface.emoji)  I am attempting to connect to a computer at home remotely and have frequent extreme lag and frequent disconnects.  I upgraded my plan a year ago so that I could have higher upload speeds and now it’s money down the drain.  I’m in a similar predicament in terms of service providers in my area and unfortunately Cox is the only reasonable option.  My download speeds are great and have absolutely no complaints and I realize complaining about upload speeds puts me in the minority - BUT, i expect to at least receive upload speeds that I pay for.   It would be nice if there was a plan that allowed you to pay for just quality upload without having to go all the way to the Gigablast plan.  (Arris Surfboard - not sure the specific model because I’m not home but it’s DOCSIS 3.1)