Laggy and Slow Internet

I live in the West Bloomfield area in Michigan.   Internet was great a couple months ago but has been terrible in recent weeks.   Every time a scheduled a technician to come out a day later I got a text saying "the problem in our area is fixed."   Then a few hours later internet is slow and laggy again.   So, when is service going to improve in my area?

Please don't suggest resetting the modem.   I already do that several times per day.    If there's no answer to my question we're moving to ATT.   I can't stand my Xfinity internet any longer.   After like 25+ years or so with Comcast/Xfinity.  

So, when is my service going to improve?  

Thx