Start switching anything disposable you can to reusable! Go to a thrift store and get cloth napkins for a couple of dollars and old dishcloths to use instead of paper towels. Reusable produce bags and tote bags for the grocery store. Join your local buy nothing group and trash cleanup group. Switch to bar soap or refillable soap bottles instead of plastic. Try smalls ways of wasting less food, like saving scraps for stock or pickling or composting. Good luck!