It's not sexy, but the number one way to reduce plastic pollution is to build landfills and proper waste management systems in developing countries. Plastic bans are largely performative and often counterproductive. Instead of bringing their own bags, a lot of shoppers just treat the "reuseable" bags the they buy a the supermarket as disposable.

https://www.forbes.com/sites/patrickgleason/2024/01/22/new-j...

https://www.latimes.com/environment/plastic-bag-ban-waste-40....