Do your country act like it is aware of its plastic footprint? If no, start voting in people in power, who actually have plans to deal with the consumption of plastic.
Even better if they are working on proposing legislation that already works with some efficiency other places and is supported by science, professionals and statistics. Or if they want to invest in changing the threat humans are to the climate.
As a private person, there is a number of things you can do to lower your personal plastic footprint: