Time, rest, keep stress low, try to take good care of yourself (some examples: good diet, consistent sleep routine, learning relaxation techniques, going for gentle walks as tolerated, limiting computer/TV/smartphone screen time, adopting a patient/faithful mindset that things should improve over time, being compassionate with yourself and learning to tune out people who are unhelpful/negative).

I take a good multivitamin, a B complex vitamin, good-quality purified fish oil, vitamin D3, curcumin supplement.

I don't think there is a miracle cure for PCS - it's mostly just about developing a range of good habits and routines and letting time do its thing.

I'm mostly recovered and (after almost four years) am back to living a normal and fulfilling life. Still working on that last 5-10%, but things are now pretty solid. I haven't always maintained all of the good habits I've listed, but they are some of the things that have helped me.