Stop buying products you don't need. I always wait months before I buy something and that way didn't buy 99% of the stuff I'd have otherwise ordered.
Not flying by plane or traveling far by fossil fuels, will save more than most day to day trash you spare. Most trash is burned, but flying is much worse to the environment than burning trash.So simply stay at home or nearby.
Ordering fruits from local plantation is also better than ordering berries transported via ship around half the globe.
There's much more invisible environmental destruction to products, than the product waste when disposed itself.
It's not easy though, because you got to research where stuff is made and companies often refuse to give insight on their shady business.
I buy from the butcher instead of pre packaged meat in plastic. I only buy new clothes or a pair of shoes once the old one is broken. Sure I own 5 pair of shoes but I'll wear each of them til they are trash.
Buying leather shoes and other clothes has lasted me much longer than fake leather shoes. I honestly wish we had shoemakers still around, I often have to throw good shoes away because the sole is completely done but otherwise fine.