If you want to dive into the Bredesen Protocol and learn about the 7 Pillars and how well people who have implemented the protocol are doing, check out these books:
The End of Alzheimer's: The First Program to Prevent and Reverse Cognitive Decline
Detoxification is an important pillar of cognitive health. Eliminating toxins from your everyday life is a great place to start. Try swapping out items for nontoxic versions.
Resistance training, cardiovascular and mind-body exercise are all important for supporting cognitive health. Check out some items I recommend to help with your fitness journey.