go vegan
buy second hand
reapir things you own that broke
switch to some sort of green electricity
small scale indoor gardening of som herbs, tomatoes or other similar plants easily grown on a balcony or within the kitchen
political action like local protests or even better get elected
volunteer work in some sort of progressive charity
organize a tenenant union or become active in the hoa

There is plenty more, the key is to make the world better and not try to make it perfect. A lot of usefull action is community driven and in those roles you can have a much much bigger impact then by just changing your own way of life.