Hang up signs at senior citizens centers, grocery stores, the mall, etc. Again have a list of references available when people call you. Sometimes you can use business parking lots, but always ask first. Pass out flyers at businesses where parents are likely to be. Target a certain business each day with a sample meal at lunchtime, or provide a coupon for a free trial meal to get people to try your service.
Many people are just too busy in the day to get everything done that needs doing.
So, make it your business to do it for them. Some of these ideas require an initial investment such as soap and wax for a car wash, however if you work hard your investment will pay off in the long run. Remember this is a job, even if you are the boss. You must be very responsible. Show up when you say you will and take pride in your work.