Another way to do this is to read a very hard book. Try to find a book that contains about 20 percent new vocabulary. As soon as that becomes easy, find an even harder author to read.
Consider learning a language or a musical instrument. The longer the task takes to master, the more you’ll need to memorize and discover in the process.
Neuroplasticity is your brain’s ability to create new connections between cells. [6] X Research source