Maybe a too short summary; my tldr would be: self-help research led to the hypothesis that acid-base balance disruption may underpin Long Covid. The hypothesis was published as a paper, the author’s successful self-treatment is described here: https://mastodon.nl/@vickyvdtogt/110202237846457614 high lactate levels were an indicator that helped finding a hypothesis which could explain the diverse symptoms of Long Covid.
I didn't see any description of her self treatment, but I'd assume that to be taking bicarbonate or anything else that say marathoners take like L Carnitine, Carnosine, Beta Alanine, Leucine, Iso Leucine, and Valine.
Yes, I only found it after looking at her Mastodon channel, it ist not a true tldr, but I think still worthwhile to mention. Maybe I should have given this as additional context at the end. Thank you for the feedback and the additional links.