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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all of the above! 

I like the idea of setting a “minimum viable goal” like making eye contact and smiling at neighbours as you walk by.

a short wave and a “how's it going” is often enough. 

it's a tiny habit that needs nurturing but it can have a huge impact on others.

I really like this one considering the "epidemic of loneliness" conversation

how can we break down the goal of "checking in on your neighbors" so there are clear tasks a person can complete?

making food for them? doing a household chore for them? just sending a text and asking how they are doing?