If I had an extra hour or a few hours a day when I had free time, I wanted to help people online, something like support or something like that.
Why do I want this? The answer is: It brings me pleasure when I manage to help someone at least a little. And also when I listened to people on the Internet, just random people, they didn’t even ask for help, I somehow instinctively felt that they had some kind of problems by the tone of their messages, and in the end I managed to cheer them up at least a little.
An organization with some structure might be a better fit.
Community theater? They always need stagehands, set builders, etc.
Same for community bands and orchestras. A librarian or personnel manager for a group like that is as good as gold.
Conservancy? Help protect your local wild lands?
Find a cause you care about and an organization that works for its benefit and call them to offer some of your time.