We have to do it. Some of us have to do it in different ways. Doing small things where you can is all well and good but literally none of us are making a single impact in capitalism by making different choices about how we're forced to participate in it. Focus on tearing it down together rather than picking apart individual choices because those individual choices still result in participating in capitalism.
Nothing is cheaper than lentils and beans. Meat is far more expensive.
I'm not a vegan but I primarily have a vegetarian diet for this reason