If you have something you are good at, especially that fetches money ,you can start making money by teaching people to do it also.
You can make good money teaching people how to do different skills. There are wide varieties of field you can teach people, from the different classroom subjects to how to coo different dishes or crafting.
You can have a tutorial school and start hiring tutors to teach people different knowledge.
Many shops in Nigeria are teaching people how to sew clothes, make cakes, beads, barb hairs, operate computers and many more.
You too can start your own. You can have different class sections everyday like morning, afternoon and evening where you teach different courses or classses of people. You can can weekend classes for busy and working class, and you know they are the one that got the money.
One thing you can do if you are afraid of losing your investment is to first tell people around you in order to know how many people you can get first or make a flyer and see the response from people. It is good to offer different courses or careers so as to have a wide audience, but you can as well start with one you know very well.