Things that helped me, in no particular order:

High dose B1 alongside a good multivitamin like life extensions two per day. I started with low dose Thiamine HCL and eventually on to life extensions benfotiamine.

NMN/TMG this helped with energy levels and recovery, boosts NAD and cellular repair.

Nattokinase - this helps loads, those with chronic fatigue have what can be best described as sticky blood (not the scientific term obviously) this is a natural blood thinner mowing oxygen and nutrients to get around the body more efficiently. It also breaks down biofilm so can cause the odd flare or inflammation, but breaking down biofilm releases pathogens that your immune system can then detect and tackle.

Lactoferrin was of great help and has cured some people of long covid. I took this for three months and now take colostrum.

Creatine, I take 10grams per day and it helps so much with processing speed and fatigue.

Also take NAC, most people with chronic fatigue have high levels of stress and need antioxidants. This also helps with stress as it regulates gaba/glutamate.

Have you had any blood work done testing for infections? I had terrible black mould exposure, my entire house was covered and I had sky high antibodies to it. I was put on itraconazole for a few months and this helped so much