Focus mode
Here's another technique I use to make gadgets less manipulative and addictive, in addition to perpetually using Do Not Disturb on my phone and smartwatch:
I use Focus mode on Android during work hours. The feature disables apps of my choosing during the specified time frame. It's actually not quite as helpful as it might seem, largely because Google allows the user to work around it very easily, almost encouraging the user to stop using it, but it's one small piece of a larger puzzle. I'm sure iOS has something similar, and perhaps it's not quite as self-defeating over there.