Here’s an idea: Every month, pick something you hate or know nothing about, and get to know it well. Spend a few hours per week, for an entire month, just learning about that subject.
Start with a kind of music you hate, or a part of the world that sounds unappealing to you. That’s where the real self-expansion happens.
Whenever we learn about something, we learn to appreciate it. So it’s most rewarding if it’s something you previously had no appreciation for.
This could be a fun project/exercise.