I dunno what to tell you, networking and sucking up to rich people is like the skill for monetary success.
Anything else and it just comes down to a matter of interests. I would say it's always a good idea to hone self-sufficiency skills such as gardening, culinary arts, foraging etc. Getting in shape and fixing your diet has a compound effect of boosting IQ which might help you make better decisions.
The answer is contingent on you--what your interests are, your skills, your goals, etc. If you can't necessarily answer these questions, now is the time to embark on a journey of self-discovery.
Be specific, what skills do you NEED or WANT to learn?
For example you can start with:
1. Learning HTML & CSS
2. Learning to read and speak properly
3. Learning to properly clean
4. Learning art and or crafts
5. Cyber-security
6. Weaponry