Here's a possible tweet for you:

"Making a difference has never been easier or more rewarding! Join us as a volunteer and help create positive change in your community. Whether you have a few hours or several days to spare, every bit counts. Let's show the world what we can achieve together! "

"Ready to make a difference? Volunteer with us and be part of something extraordinary. Every effort, big or small, contributes to positive change in our community. Together, let's inspire and create impact that resonates far and wide!