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).
This is an example of passive income that isn't quite as passive as it may seem. Yes, if you own one or more homes or apartments you can collect regular rent checks from your tenants. But in exchange for that, you need to keep the properties in good working order, along with insuring and paying taxes on them. You may need to chase down rent checks from some tenants, too, and you may have several months without rent checks when you're between tenants.
I just pulled in $500 the other day by signing up for an American Express card for my wife, and a Chase Ink card for my business. I’m planning a trip and we are paying for it all by using the sign-up offers. There are also no annual fees on these cards. So I recommend taking advantage of a few signup offers and you’ll easily make $100 (if you qualify).