Introverts (boys) - what do you do generally in free time to be happy or what makes you happy?

So, I know a person. He is very very introverted and he doesn't talk much to anyone. He is not interested in anything. I tried to prank him using some fake account saying I have crush on you kind of but he just blocked it. Generally people will have that enthusiasm to know who likes me or generally if some girls talks to them they like to reply back nicely. This person is just completely different. For me, even a message from some old friend will cheer me up and I talk to them nicely and with so much interest. This person doesn't talk at all and for 10 messages he replies one or thumbs-up or seen. I always wonder what's something these kind of people like to do or what makes them happy generally? (I am also jealous seeing his calmness and ignorance with everything) So if anyone can relate, please share what makes you happy or anything relevant :)