Another thing to try is NAD+/CoQ10 supplements. I had some brain fog after covid (I'm officially diagnosed) and NAD+ seemed to help a ton.
I had researched the brain fog with covid 19 and found a lot of research pointing to NAD+ / mitochondrial disruptions as source of brain fatigue [eg 1]. NAD+ supplements are well studied for anti-aging too. So it seemed to have a high probability of helping.
The NAD+ supplements can increase it according to a few research articles I've found. IIRC, it's like 10-20% increase in some cases. I also added CoQ10 as it works together with NAD+.
I had researched the brain fog with covid 19 and found a lot of research pointing to NAD+ / mitochondrial disruptions as source of brain fatigue [eg 1]. NAD+ supplements are well studied for anti-aging too. So it seemed to have a high probability of helping.
1: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9234841/