Your biggest impact is as a worker. Most of us produce more than we consume (where the excess usually becomes investor profits). We really need to produce less or our consumption won't make a difference.

In the past, workers formed unions and collectively bargained with governments and employers to reduce working hours down to the standard work week we know today. We could reduce this further to a 4- or a 3-day work week.

We could also use collective worker power to demand many other things, such as stricter environmental standards in the workplace, just as we bargained for stricter health standards in the past. Or better environmental standards for children in schools or for public spaces, just as we bargained for children's rights and other standards in the past. (All these modern standards were fought for, they were not handed out freely)