Try "Meatless Monday" is a much more effective message than animal welfare, since it offers a reasonable path that doesn't require changing everything all at once, and doesn't tie your past actions to guilt.

People are highly motivated to push back against animal welfare arguments because it makes them feel like bad people. "You can easily make things better by just abstaining once a week" doesn't challenge their identities nearly as much.

I'm also holding out hope for vat meat. I like meat but I'd really be happier eating it without an animal having to die