I'm also pretty sure that I'm doing so badly because of the stress I've experienced during the pandemic, really at a level I couldn't imagine, and, having forgotten I have MS, I didn't do nearly enough to counter it and instead used coffee and dairy, two things known to be avoided with MS (by some patients at least, doctors IME don't even mention it).
I would do anything and sacrifice anything if it could remedy the current issue, but it seems it's more related to some longer-term evolution that doesn't respond to these things... We'll see. I've only quit coffee about 2 weeks ago when I definitely noticed my legs going numb after running wasn't because or overexertion... And then I made the connection with my cognitive issues.