I know a lot of you are committed activists. I also know a lot of you aren't. This list is for the second group. These are things you can do to passively or easily to make the world a little less shitty without trying very hard. These are not a replacement for organizing, these are little things you can do to make the world a tiny bit less miserable.
-join a buy nothing group
These are just groups of people who agree to treat things as though they aren't commodities. They're also a good way to get rid of stuff and get sweet new stuff free.
-move your money to a credit union.
They're like banks but members own a share of it, so they tend to be better to people.
-eat vegetarian one day a week.
This lowers your carbon footprint by quit a bit. Yes, the onus is on corporations, but that doesn't mean you're totally off the hook.
-go to Anarchist Black Cross's website and write a political prisoner. They're not all anarchists.
It takes as much time as posting and makes someone a little less lonely and a little safer
-put a sharps container in front of your home and maintain it.
This is convenient for drug users and lowers the property value.
-set up a recurring donation to a local org or tribe.
I want to add that I really think lifestyle changes are neccessary. Not the whole picture, just neccessary. They help create the grounding for a new culture. It's one thing to want a culture of empathetic people, it's another to create an institutional and economic basis for it.
Participating in these things can change people too. Marx thought that people become what they do. Wage labor makes proletarians, revolutions make communists. If you do these things you will become a better communist subject. These are what Mark Fischer called "technologies of self," the things that help you move beyond capitalist subjectivity. He also recommended consciousness raising groups and psychadelics FWIW.