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The deposit return scheme for plastic bottles should also be much more widespread than it is now.
https://www.ideaspies.com/posts/a-deposit-return-scheme-that-reduces-littering
Many countries used to send their dirtiest recycling to China, where cheap labor sorted through the mess extracting valuables and dumping the rest. Plastic waste is a particular problem. But in 2017, China severely tightened rules for taking contaminated trash.
The Recycling Partnership in the US tested a program that educates citizens on what materials had value to recyclers.
They found that what worked best was sending a mailing that educated residents on the rules, then following up by enforcing those rules uncompromisingly. This included putting a team of inspectors out to evaluate each recycling bin and leave Oops cards on bins they rejected for collection.