Well, first, props to you because you're actually doing something to initiate contact. That's a really big deal; more people need to do that. (Maybe even some that don't wrestle with loneliness.)

But what's you're next step? Someone comes up and marks that they feel really lonely. Do you get contact information? Invite them to something? (Invite them to what? You may have to create something - a board game night at your house, or a "lonely people shopping together" time at a grocery store, or something. You probably have to create that "something", because you're the one who's able to at least reach out, and the ones who are responding probably aren't there yet.)

You're finding people that need something. The next step is to find a way to connect them - with you, or with each other, or with someone.

For any activity you come up with, some people won't be able to, due to time or temperament or personality or something. So maybe what you need is more than one. (Eventually. Look, don't get overwhelmed by that. Just one is the next step, in my view. And maybe some helpers.)