People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer without having a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.
The nuts and bolts of an annuity boils down to some very basic contracting. You, as the investor, pay a lump sum amount to the annuity issuer, typically an insurance company. At a pre-defined period, typically your retirement, the annuity would mature and start paying you a fixed amount every month. The advantage of an annuity is that you will not have to pay taxes until the annuity payments actually start accruing to you. Although considered low risk, annuity provides charge high fees and their success is largely dependent on the reputation and stability of the insurance company underwriting the annuity.
While these models have diminished in mature e-commerce and online advertising markets they are still prevalent in some more nascent industries. China is one example where Affiliate Marketing does not overtly resemble the same model in the West. With many affiliates being paid a flat "Cost Per Day" with some networks offering Cost Per Click or CPM.
You could try advertising more, for example, by putting up signs around the neighborhood, posting about it on social media, or having people you know spread the word. You could also try doing it in a different neighborhood that might have friendlier people, or do it in a time and place where there's likely to be a lot of people walking around the area (e.g., near a church before the end of a mass). https://buzzingofferbusinessinvesting.tumblr.com/