Extremely slow speeds after nearby Xfinity work

Hi everyone. I was wondering if there is any advice for my situation that has been going on for about 5 or 6 weeks now. I've gotten multiple texts from Xfinity saying there is a problem with the network in my area, then they say it is resolved. But ever since then, my speeds have been less than 10mbps when we typically get 300+. I've talked with 5 different agents who had all sorts of different answers and have had 3 techs visit my home who insist the problem is everything from my equipment being bad to the outside line being bad. Even after replacing all my equipment, it still doesn't work but they have no answers. Sometimes it will seemed to be fixed and return to normal for a few days, only to go back to the slow speeds for a week or two at a time.

I liked the speeds I got from Xfinity, but this is quickly approaching the point where I'll have to switch providers because there is no one at Xfinity to help me. Any help or advice would be appreciated!