As a new poster, You can usually mention names without posting links.
There are a lot of brain training systems that over-promote the capabilities of their system.

The goal in the early days is to not stress the brain but rather keep it active. Learning how to focus while remaining relaxed is good. The hyper or intense mental effort training can cause fatigue and cause a relapse.

No multi-tasking. No pushing in environments with excessive or conflicting stimulation.

Find your best functions is your best environments then slowly add extra stimulation to see if you tolerate it.