Cannot Livestream + Packet loss

Hello! I have been trying to livestream via YouTube for over a month with no success. I have bought a wifi antenna, new hardware, updated all my software, even had a technician come out and activate a coax port to physically move the router, and using PingPlotter I can see there is repeated and persistent packet loss on the backbone (on Xfinity's end). I am utterly at my wit's end. Without livestreaming I have no income. PLEASE help me!