To go back to an earlier discussion, this is the reason why I continue to promote the use of gaiters*. While gaiters may not always be as good as other masks in all situations, they have the huge benefit that they can be integrated into life very easily. People will take a mask off when they're alone and leave it behind; a gaiter stays with you. When people get lax over time, we need solutions that can become second nature.
See also: painted dots on the floor in checkout lines to show you what 6' looks like, easily accessible anti-bac stations, and parking lots designed for curb-side pickup.
*Obviously, I'm also a fan of gaiters that are multi layered, the correct material, etc.