Some of mine are: reading 52 books, going for a walk at least once a week, getting a new piercing, and doing my budgeting every week instead of waiting multiple weeks, etc etc
What’s everyone else’s? Maybe comrades with similar goals can be accountability buddies 
I feel this, but remember - adulthood is what you make it. You will never have endless free time again, but you can bring some of your favorite hobbies from childhood into your adulthood. I feel like that fills the void for me. Good luck!