Recently moved to rural area and service was great, after 3 weeks I have no mobile data, why?

Prior to getting onto this peer assist forum I found that all methods to reach T-Mobile support require accessing T-Mobile's mobile network, but my issue is being suddenly and persistently unable to access T-Mobile's mobile network no phone without wifi, and no SMS/MMS.

This is very difficult to troubleshoot therefore (and I have inadequate Wi-Fi making it worse). When I've recently traveled from home to locations with good Wi-Fi I'm still largely unable to call, receive calls, or exchange texts. So it's a mobile data issue and not solely an internet issue.

I've tried many remedies. Frequent powercycling of the device; disabling battery-management; disabling Wi-Fi calling; enabling Wi-Fi calling; disabling roaming; cooling the device in the refrigerator; removing the SIM, examining it, finding no damage or wear to the copper, cleaning the drawer with alcohol and an air duster, replacing the SIM; among other things.

A little over a month ago I moved from Massachusetts to rural northern Vermont. TMO's coverage map seems to show that I have a 5G tower less than a quarter mile from me in one direction, and only about a half-mile away in the opposite direction. Service was excellent for over a month. And now, for over a week, I have virtually none.

Possible causes I have considered:

* My SIM has gone bad.
* Either recent storms or some other even has affected the local
access points or WLAN segments in use by T-Mobile.
* The coverage map is incorrect or out of date.
* My service has been throttled or in some other way been rendered
unusable, without explanation.

Can you help me to determine a fix, please? The nearest T-Mobile Authorized Retailer and service location is almost 125 miles away and a 3hr drive.

I have emailed support with no response. I do not use Twitter/X or Facebook Messenger. I've used the unofficial Reddit support group in the past -- I appear to have stumped them, this time.

I appreciate any comment or suggestion. Fix me please! Thanks.