High ping issues, looking for suggestions.

So I've been playing NHL since about 2010, and have played pretty much every game mode throughout the years, ultimately settling on EASHL as the main. A few years ago I thankfully switched internet providers from Spectrum to AT&T fiber and immediately had the best connection I've ever played on. Then about 8 months ago I started noticing my ping on every server went up by about 20-30 ms. I play in online leagues and have dabbled a bit in esports, so the change in connection started killing my motivation to play. I've talked to AT&T countless times to troubleshoot, had a tech come out in person and change out all the hardware, messed around with DNS settings, router settings, pretty much everything I can think of. Then a few weeks ago one of the AT&T customer support guys changed a couple settings and I noticed my ping went back to normal on the East (Virginia) server, but on Central and QC my ping is still 20-30 higher than normal, getting anywhere from 65-70 on central and 90-95 on QC. I just wanted to see if anyone else has had similar experience and if they found a fix, because it's driving me crazy trying to figure out what changed after years with no issues. I always play on ethernet and have a 1GB internet plan. At this point I don't know if it's an ISP issue or something I can change in my settings on my Xbox Series X or something that changed with the NHL servers. Any feedback is greatly appreciated. For reference my ping in the past was always 46-48 on both East and Central, and always about 60 on QC.