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.
I absolutely agree that blaming individuals is the silliest thing possible, because part of my core beliefs is that people are ultimately reflections of their experiences and circumstances (good or bad), which you can't control or decide. However in the case of veganism, as far as ive read, an individual choosing to be vegan does have a tiny but still meaningful effect on the supply chain, and to me at least sparing just a couple animals is worth it. So blaming people is the wrong mindset, instead we should all be addressing the individuals in our lives about these things, however is reasonable.
But yeah its a collective problem and imo the collective solution is to have as many people as possible working to collectively boycott the (heavily subsidized and unsustainable) industries, and that starts with encouraging friends and families to do what they can reasonably do to participate in this movement. I see it as a movement thats growing rapidly and is already having effects on these industries, so in terms of fulfilling forms of praxis its up there.