How can a person become wise...

To answer this question we must define wise:

Knowledge shrinks as wisdom grows: for details are swallowed
up in principles. The details of knowledge which are important
will be picked up ad hoc in each avocation of life, but the habit
of the active utilization of well-understood principles is the final
possession of wisdom.

Fake it till you make it.

“To know and not to do is really not to know.”

Knowledge is not enough. Actually walk your own path. No deviations, Always at all times so it will swallowed up into your body. Then you will be wise even when you forget.