Considering half the country threw a temper tantrum over being asked to wear a mask during a respiratory pandemic, I don’t think you’re being realistic in your view of everybody being able to go vegan. Many of these people threw a fit over AOC “wanting to take away your cheeseburgers” even though that wasn’t what she was proposing; they just knew that it would rile up the rural base.
I think it’s much more reasonable to convince people to make two easily implemented changes: no more meat at breakfast, and meatless Mondays. With these two easy changes, only 12 out of 21 weekly meals is eligible for meat, which is a ~43% reduction. Not everybody will do it obviously, but the same people willing to cut 10% will probably cut 43% when presented in this way. Especially if you bring up the financial cost, health risks, and storage inconvenience of buying and eating so much more meat than is necessary.
I also think it’s a little silly to say that it’s easier to go vegan. You need to study food labels and nutrition facts to see if there is some animal byproduct involved. When you go out to eat, it’s not always clear whether options on the menu are vegan friendly, but restaurants are getting better about that nowadays. But I think you’re also assuming that people have the means to always choose a product that may be significantly more expensive. I think you’ll have better luck convincing people to occasionally think about whether their stirfry really needs steak or if mushrooms are actually enough to carry that earthy, satisfying bite they’re looking for this time.