My own experience, then some interactions with brain experts around here .
Brain growth is an amazing field, it definitely made me smarter, but overall it was making me more anxious. To the point I stopped it naturally.
Re-discovering Attention and Focus, then Enhanced Brain Hemisphere was a true blessing.
I have done recently some test, and came to the same conclusion. We do not need more brainpower as ADHD-iers (or autistic brains for some), but more peace & harmony.
This one is good as well in complement btw: Longevity (ISIRB and RBM3) - YouTube
(though this is a lot of fields already)