Being hit by luck with one of those is always great. But - the first internet companies mostly went away. Same goes for cameras, being quickly replaced by phones. Bitcoin is not a company, so that's a good thing, yet there are many other blockchain-technologies that will most likely be more successful in the future. And so on.
Retirement is in community. It's important to create community and contribute to it while doing well - creating it by ourselves, in a certain way. There are many "poor" people who are abandoned by political structures, yet somewhat happy. Because they built and maintained relationships within their neighborhood while younger. It's not a guarantee, of course, values degenerate, too. But finding those we could lean on when money went away?
And finding what we could give them? Gardening skills with brain are a big part. Being able to somehow adapt gardening to the new environments by different interconnected mechanisms to save water, keep warm, keep from being burnt, keep the soil rich and such are trades of the future that can be developed now.
And even if a miracle happens and global climate change is suddenly not as urgent anymore - those skills won't go away. Solving one problem leads to being more capable of solving the next.