ScreenTime on iPhone helps. Have someone else set the pin for you so that you can't work your way around it. Also, one of these timer based lock boxes may help

ScreenTime on iPhone helps. Have someone else set the pin for you so that you can't work your way around it. Also, one of these timer based lock boxes may help: https://www.amazon.com/s?k=lock+box+timer+for+phone https://www.amazon.com/s?k=lock+box+timer+for+phone