Distraction is usually avoidance wearing a costume. The kitchen has never been cleaner than on the afternoon a hard piece of writing was due.
Which is why blocking apps only gets you so far. The pull isn't toward the phone; it's away from one specific task that makes you feel incompetent for the first twenty minutes.
Name the task you're actually avoiding and start it badly, deliberately. Once you're inside it, most of the distractions lose their gravity. They were never that interesting.