> What do you want me to do that can credibly solve this problem?
Educate yourself, and educate others. Fight ignorance and consumerism. Fight those who're making it worse.
> Clearly almost anything I can do as an individual is not going to have any kind of influence
Those in a position of power would like you to believe that. Because this viewpoint preserves the status quo.
All social justice movements in history started with a few individuals loudly demanding changes while being ridiculed by the masses, whose own lives they were trying to improve.
A tsunami is made up of many drops together. Be the change you want to see in the world, and all of that.
> we must know that it has a reasonable chance of success
We now know that nobody will solve it for us, certainly not the politicians or the corporations, until we loudly start demanding change. Meanwhile, we should prepare for the worst while simultaneously trying to prevent the worst from happening.
It may not work out in the end, as shown in the movie 'Don't Look Up.' The protagonists are sitting after the lost fight, having dinner while the extinction event is happening. Their last words (if I remember correctly) are: "I'm glad we tried.".