What one person can do (in terms of voluntary personal/household degrowth) may be tiny in numeric terms, but there are millions of us and we are worldwide.
Also, it’s not just about the raw numbers, as far as how much difference one person living in the rich industrialized world can make. One person can greatly increase their impact by talking/writing/posting publicly about what they’re doing. This helps reset our twisted cultural mainstream norms of hyperindividualism and consumerism; de-normalize extreme consumption; normalize voluntary reduction.
Make low-footprint living cool!