The article mentions low-dose rapamycin (aka sirolimus). That has recently been helping me, with my Chronic Fatigue Syndrome (CFS; overlaps or may be the same as long covid) that I have had since 2006 after a cold from which I never felt like I recovered (fatigue). I have gone from averaging maybe 1-2 hours of slow desk work if I am careful, and few to no social activities, to being able to go to church again (once so far) and do 4-5 hours/day of slow desk work, for about a month now 5-6 days a week. I'm really hoping to be employable again in the future.

The Dr. prescribed it off-label (they are also doing a study and a doctor had a very positive personal recovery experience with it). My dose is 1mg ONCE per week, then two, then three, building up to 6mg ONCE per week.

I mention this in case it is helpful to anyone else.