Nootropics are cool and all, but the single best thing you can do for your brain health and overall cognition is simply just consistent cardiovascular exercise.
The increased circulation helps supply the brain with additional oxygen & blood flow which only promotes improved brain cell function! Don't neglect your cardio!
20-30 mins of moderately difficult cardio 3-4x per week is more than sufficient to reap all the benefits here - PLUS your heart and lungs will thank you for doing so!