I always said "That a person that willing to think for his or her self and work hard at what they want or willing to learn will succeeded."
Many people believe that education can only be learn through school, college or classroom study. Most studies in a classroom will give you the basic. It up to you to learn more. The library and internet are good FREE sources of learning. With learning/training a person can open their self for better earnings and life. Whether it be full time work or just supplementing your income.
I will make a list of thing a person can do to make Supplemental Income :
Photography - make videos, pictures or animation art for Youtube, Dtube, and few other sites.
Edit same videos, pictures, or animation for selling on various sites like Shutterstock.
Trading - trade stocks, forex, or crypto.
Crypto-mining - mining crypto
Writing - freelance writing articles for various websites from travel to crypto.
These are just a few ways to supplement your income. There 100's of ways to do it. Start with what you know and have.