I think the problem with things like switching to alternative sustainable packaging is persuading people that their actions make an impact. While the actions of one person might be small, collectively the actions of many "small" people are huge.
Why not create an app to track your individual actions and the thousands of people also using the app taking the same action?
Collectively we can make a difference!!
It reminded me of this video - https://www.youtube.com/watch?v=5qx2WFpNTPs