If you have a yard or some space to grow food, you could grow items to sell to your friends and neighbors. If you have enough space to grow a lot of food, you could even join a Community Supported Agriculture – where local farmers and residents pool together to buy and sell fresh produce. This may not make you a millionaire, but if you have enough to sell consistently, it could be a great income stream.
This is one of my favorite "most unheard of" ways to make money - especially for college students. Being a Loan Signing Agent is a great way to earn money in college because you can make $75 to $200 per hour working for yourself on your own schedule. Students can be signing agents and earn extra cash when they want. The best part is you need nothing more than a notary commission (which can often be attained by simply filling out an application)!
Institutes keep conducting researches on a regular basis and need people to take part in them. While some might not pay you, others may. These researches are easy and require you to answer basic questions which help them understand a concept better and come to a conclusion. It's always good to have a big study area so there is always a demand for people. You can also go for college experiments conducted by departments like psychology and earn money.
That’s my plan. No kids, no spouse, parents deceased. I’ll never be able to retire. On PSLF, but forgiveness not approved until 120th payment. Many are not being forgiven now. I take courses to stay in deferment. FedLoan bases payment on gross; not net. How does that make any sense?! After bills I can’t afford the payment. I have 3 grad degrees. Was supposed to be a psychologist. APA & NCE won’t accept my 15yo degrees for the national exam. So I teach at a CC. Over 180,000 in debt now and it grows monthly.
Search for freelance writing and editing gigs. The rates for these jobs vary: you may be paid by the word, be offered a flat rate for a project, or in some cases can be paid an hourly rate. You typically won't be able to retain copyright over your work or collect royalties, however. Even so, by doing freelance work you can build a portfolio and make valuable connections which may later pay off with more stable job opportunities.