Put your life on airplane mode for an hour. The runway will still be there when you land.

Being reachable at every moment costs you the kind of thinking that needs an unbroken stretch. It is not the interruptions themselves so much as the standing possibility of one, which keeps part of your attention in reserve and stops anything from going deep. An hour of genuine unavailability is a different quality of hour.

Pick one hour this week and make yourself properly unreachable, not just face down on the table. Tell anyone who needs to know. Everything that arrives during it will still be there afterward, in the same condition.