What skills can I develop in my early 20s to become high value?

Being confident. Yes this is a skill. Fake it even if you don't have it yet. It will make you more confident gradually

Selling skills. You don't have to be a salesperson to master such skills. Whenever you need help or you want to achieve something, selling skills will help you a lot

Convincing yourself. Sometimes convincing yourself is harder than convincing others. Have the courage to face the truth and make the changes.

Positivity. Life is hard. Those who're happy are not the lucky ones, they're just wise enough to choose to stay positive.

Independence. Try to figure out things actively instead of waiting for help. Depend on yourself but not others.

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Stay positive and be happy