The primary source of antibiotic abuse is in farm animals.
Do you really want to help? Start eating less meat, and tell others to also do so. Tell them why. Tell them to also tell others. When there is less demand for meat, then there will be less land devoted to animal feed/grazing, and more to food crops. Less animals that can be infected, less antibiotics used, etc, etc.
Want to really help solve it? Don't eat meat. Get others to stop eating meat.
Invest in faux/lab-grown meat companies. Disease free meat can be grown. We just need to make it profitable.
Honestly, this is the future. Farming like this is unsustainable, not only for the antibiotic reasons.
(I'll spare everyone the ethical/transhumanist discussion.)