what are the most beneficial + tangible things a person can do to improve their local community?

planting a tree, picking up trash, painting a building, etc

what else?

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this is going to sound corny, but imho walking & talking with force of numbers changes a lot of the dynamic. buying local helps a lot, word of mouth + sharing gig opportunities is improvement that pays for itself later on. tangible = nth order effects as well (imho).