I was in the same boat for a while, but I gave it a shot several years ago when I was doing a lot of driving every day and was powering through audiobooks. This might sound a little hyperbolic, but it actually ended up changing my life in a lot of little positive ways. For example, I used to work with a guy that got made fun of for some of his interests (nothing harsh or super hurtful, just poking fun). I was always really supportive of what he was into and asked questions about it. I wasn't trying to get anything out of it, I just remembered the book and thought it's nice to be nice. When he got married about a year into us working together, I was the only one from our job that he invited to his wedding.

> This rant about radiating happiness towards people without expecting something in return...

This was one of my main takeaways from the book. I would argue that you do get some things in return: richer relationships with the people you already know, pleasant encounters with people you may not know well, and increased enthusiasm for your own interests compounded by hearing someone else explain how enthusiastic they are about their interests.