Help getting better ping as a North American Player?

Hi, I'm a North American player from California who has always struggled with bad ping. I average around 170-200, and while playable; PvP is certainly not. I struggle to get interrupts, and meet the positional requirements for backstabs/shreds ect. I have a good internet provider, a very fast download speed, and an ethernet connection but for some reason my ping is pretty bad. I've seen other North American players with 100 ping or lower and was wondering if someone could give me any tips, or redirect me to any guides that might help me to get lower ping. I would gladly appreciate anyone who would take the time out of their day to assist me in this matter.
Thanks!