Big factors like industrial pollution, transport, long distance shipment are 1) too heavy to move (you need political power, and political power is also heavy to move) 2) but they do depend on people spending their money for their product.
I dream of a smooth swap (https://proxy.duckduckgo.com/iu/?u=https%3A%2F%2Flh4.googleu...) where people allocate more to simple and local life. Forcing the economy to curb accordingly.
I have the feeling that it will make (and it does already) people a lot happier[0], and since having to do locally you can't rely on economies of scale so people will have things to do instead. It won't be fancy or pretty but plausibly more meaningful to work with and for your surroundings, even if it means no more white collar position in a shiny tower.
There are online places to discuss, reddit has many (r/collapse, r/guerrillagardening), some people also make discord groups. You might take a peek.
https://www.sunrisemovement.org/
There is no chance your individual actions will have any impact. Our only hope is drastic, large scale policy changes at the national and international level.
If we managed to invent a carbon removal technique scalable and cheap enough to deploy on a massive scale, we'd still be able to prevent the worst.
The problem is, currently there is no money in it, so the efforts are not the size they should be. We'd need a war economy on all fronts here.