I don’t know who you called, but try tomchei shabbos- they use volunteers to drive around the deliveries, or bikur cholim organizations- maybe they know of people who need rides to the hospital or medical appointments. Ask the rav of your shul if there are eldery people who might need a ride to shul or shiur. Go in person to these organizations so they can meet you and evaluate whether they can trust you. Single people can do lots of chesed!
