Few key things I did in my 20s that have helped me tremendously

Setting my own goals
Being honest & accountable
Revisiting the notion of Success, determinants of Happiness & What matters to self - How would I measure my life & the last 7 minutes of life
First principles thinking & probabilistic thinking of critical decisions
Financial Literacy
Not subscribing to conventional paths, stereotypes or status quo
Operating playbook - MyOS (iOS)
Learning how my relationships affected/drive me, minimizing time with those that are not helping
What also matters - Nutrition, Fitness, Mental Health, White space
& making lot of misatakes 🙂