Mutual funds are a large aggregation of stocks, bonds, and other financial investments, except that they are managed by professional investors. The advantage of mutual funds is the possibility of diversifying your financial investment over a large pool of investments. Unfortunately, it is not easy to predict the risk and rate of return through mutual funds and depending on the professional expertise of mutual fund managers, the success is likely to vary.
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).