There are hundreds of accounts of people who have had substantial recovery (thought probably not full) from ME/CFS. The problem is that what works for one person doesn't work at all for 99% of other sufferers. Some people say injections of B12 fixed them up; others move to the desert and get away from environmental issues (and perhaps stress); others benefit from a very gradual incline of exercise; a few have had spinal fusions; and so on.

My wife has had ME/CFS for more than a decade. Honestly many of the touted remedies she finds online sound like snake oil, but if you are suffering and nobody has a good clue, you try each one in turn hoping you might be one of the lucky people who responds to a given modality.

Cort Johnson runs the website Health Rising, which acts as a clearing house for recent news about ME/CFS (and recently long covid as it relates to ME/CFS) and there is a community built around that site.

https://www.healthrising.org/about-us/cort-johnson/