Using a daily planner (on paper, not a app). I figured this out about 2 months ago.

Being able to write down the tasks and scan back through my backlog has helped me be more productive. For me, using a calendar service or task manager app just does not work as well... BTW, I am a millennial.

edit: I am 10 years younger then everyone else at my company and get questioned all the time about "why I use a day runner" when everyone else is on a smartphone.