Significantly reducing our reliance on plastics cannot be taken on as a single issue or at the local or even national level.
Plastics are a byproduct of the fossil fuel industry.
That’s the only reason materials which were marketed to people as miraculous in the 40s, 50s and 60s are so cheap.
The extraction industry is global, and the production of plastics is as well.
Even if one nation reduced its fossil fuel and plastic consumption significantly, there will be other nations that will take the opportunity to get that cheap energy, materials and industry.