This is something I struggle with profoundly daily. Yes, my "individual" action as a 1 in 8 billion people, or 1 in 300 million Americans isn't going to move the needle. Large scale governmental and corporate action is needed. But how do you expect that to happen if not enough people want it and show they want it?
I see people near me casually flying to Europe for a ski, raving about A5 Wagyu or Uni from Japan or some shit, etc. All of these are undoubtedly adding to the demand, so why would the companies stop? (Of course its because they fail to factor in the long-term cost of there will be less customers if humans can't live on this planet anymore)