Stop its gravitational pull
I’ve found tethering is the best way to avoid the gravitational pull of the smartphone. Not tethering in the electronic sense, nor tethering your phone to you, but tethering it to say a charger in a completely different part of the house, or wherever you tend to be. Make it annoying to have to get up and use it. Make it that you can only use it tethered too. Take out the convenience completely, and see your usage drop. That, or throw it out the window.