People are driven by incentives. People like meat, so instead of asking them to stop eating meat, which most won't do, make it a better option that fits with whatever the asker's goals are. In this case, you'd want people to care about animals or decrease environmental effects, so the way to do that while also considering people's incentives of loving meat is to have lab grown meat, or something close enough like plant-based meat substitutes that taste like meat.
You will never get anything done by appealing to individuals to change their habits wholesale, that's just not going to happen, people are too entrenched in their defaults. You have to appeal to people's wants and desires and bend them towards your own goals. Impossible Foods and Beyond Meat (and now Micro Meat, etc) have got it spot on: economically target the incentives of wanting to eat meat but make them out of non-sentient substances like plants or bacteria growing muscle cells.
That people still consider that everyone will go vegan or stop eating meat altogether is a fantastical view of the world, it has no basis in true reality. There will be more people contributing towards the lessening of the suffering of animals in the next few years via eating these non-sentient substitutes than has ever been achieved in the last century of the modern vegan movement, simply because it seems now finally that larger human incentives are being targeted directly, which is much likelier to effect change than individualistic pandering.