• yoga

• my current career (which would have the add-ons of saving more sooner, meeting my spouse earlier, getting to travel more when I was younger, bought a house earlier, etc)

• went to the dermatologist to get a diagnosis. I was miserable for years and could have solved the issue much sooner, since she knew exactly what was wrong with me the second she saw me

• learned about investing/retirement accounts

Put in the effort to learn another language