One complaint or limitation with common yard cleanup help is a lack of plant knowledge and so they damage things. Maybe knowing proper bulb, annual, perennial, vegetable care is a niche you can fill.
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(Had a small group at a library event. Some one interested in using only native plants complained they couldn't find help.. but they were such sour people, so bee otchy, that I would never offer to help them. And suspect they'd be cheapskates too.)
A lot of people too busy to keep a neat yard also hire lawn service which could easily add on some cleanup while there.
Consider offering business service? Tidy up the plantings around fast food?
