1. Using the 80/20 rule.
We should spend 80% of our time on things strategically important.
2. Finding your Einstein window
Everyone has the period of every day where you have your little mental peak, where work feels almost fun, problems feel no problem at all.
Try our best to protest that time and spend that time dealing with most difficult and hard problems.
3. Protecting your window
You can't say yes all the time. Saying no, you can still be helpful, if you'll help them later.
Yes, I can help you. But not this moment.
Turn off distractions. (YOUR PHONE! Turn them off and get focused)
4. Communicating your availability
Start proactive about broadcasting your availability.
Try color coded system.