Before the week starts, I name a main focus for each day. That way nothing important gets neglected just because it wasn't the loudest thing that day. A big project can get two full focus days while two or three other priorities still get real attention across the rest of the week.

It's basically production scheduling applied to your own time. Lock in the near-term schedule, then treat that lock-in as real. Some cleanup and reactive work will always bleed into a focus day, and true emergencies get to bump the plan.

The part that matters is the bar for what counts as a bump. If things that aren't actually emergencies keep knocking your top projects off the schedule, you're not planning your time anymore, you're just running a reactive department. Protecting the lock-in is what keeps you steering instead of getting steered.