"Collapse early, avoid the rush."
I've read in several places now that satisfaction with one's standard of living is largely the result of comparison; comparison with those surrounding one, and comparison with one's previous circumstances. Surround yourself with high-consumers (i.e., rich people) and you'll start to feel like you need to increase your consumption. Live high on the hog and get knocked down to a median lifestyle and you'll feel unhappy, despite your material needs and comforts still being well-supplied. Scrape by and one day make it to a median lifestyle and you'll feel quite satisfied, like you've finally "arrived."
I can't help but feel that the two "comparisons" are hopelessly intertwined as well; it takes a degree of psychological and emotional skill with oneself to feel happy despite "losing ground" against one's social circle. I don't doubt the dissatisfaction remains even if your whole social circle declines at the same rate, though, and I suppose this intertwining is orthogonal to the situation I'm imagining most of us will be in as the polycrisis deepens.
As the polycrisis deepens, we won't be able to supply for our needs as well as we can now. Things are going to get more expensive, the world is going to get more chaotic and violent, there will be more (and worse) disasters, etc. I don't think anyone can fully prepare, and I don't think it does any good wearing oneself out with worry in excess of what it takes to motivate oneself to do what one can do; I think we've got to try anyway.
I think one of the tricks will be to learn how to get by on less before less is forced on one. Knowing how to "scale" one's life up and down, but especially down, will be a helpful skill. Having already scaled one's life down to fit in the constraints of one of the possible less-functioning worlds of the future will likely prove a helpful adaptation, materially and psychologically. And I don't think we can overestimate the importance of the psychological. Finding a way to carry on despite everything is going to be harder and harder.