A friend of mine (80+ yrs old, somewhat overweight) beat it within a few days last year by taking megadoses of Nano Vitamin D (liquid). After 2 months of long COVID, I finally broke down and did the same after she convinced me that it would work. It was what pulled me out of constant relapses of symptoms. I wish I had done it sooner. I am 54 yr old female, just for reference. Also, anti-inflammatories (tumeric), Vit C, Zinc, Quercetin, rest, liquids, good nutrition. This is not medical advice, but the Vitamin D was the missing piece for me. I wish you all the best.