You can start and run your own business, as a mobile screen repair service business, and make good money doing it. Most all homes have screens on the windows, to help keep the bugs out when the window is open. Lots of screens get rips and tears, and look unsightly after a few years in the weather.
You do not have to buy new screen windows to make them like new again, you can fix them right on the spot for home owners and businesses.
You can replace the old screens with new ones, at a fraction of the cost of new screens. You can buy screen material at home improvement stores, and they also have the hand tools to cut, and replace the screen material, and make it look nice, tight, and new looking again.
You can call some local screen repair service companies, and get an estimate to see how much they are charging for screen repairs, and that would give you a good idea what the going rates are.
You can make up some fliers, and put them in sandwich baggies, with a few stones or pebble to give them a little weight, and then drive around slowly and toss them into each driveway you slowly drive by, to get new customers to call you . You should also have some nice signs on your auto, so customers can call you to fix their screens.
You can make up a flier and contact house painters, landscapers, window cleaners, and more, and offer to give them a commission for any jobs they send your way.