Not sure, as it's something I'm still learning.  Some ideas, though:

- Read a lot.  Fiction, nonfiction, essays, and occasional news.  Or if reading isn't always practical, podcasts and audio books do a pretty good job in the place of physical books.
- Talk about meaningful things with your friends.  Make connections.  Think about how the movie you just saw relates to the essay you just read.
- Engage in hobbies.  Something that interests you can you can get excited about with other people.
- Jog or garden or do something physical outside, that makes you attend to the weather, the skies, the seasons, and the natural world.
- Ask questions and listen.
- Laugh at other people's jokes, and at your own.