Follow your questions. If you see or hear about something cool don't say "Oh that's cool," and then stop going down the rabbit hole. Keep going until you stop wondering what's next.

Follow up to that. Write about what you've learned. Make sure you can explain it to someone else. Levels up communication + whatever you were learning.

Exercise. Eat healthy. Laugh often. Keep in touch with friends. Be a good friend. Go outside and talk to strangers. Longer you live, the more days you get.

Use GTD Method.

Play games (scrabble, bridge, chess, go, battleships, connect 4, doesn't matter) without looking at the board/do puzzles without moving the pieces. Develops your working memory.