How do you get back to work when you lose focus?

I use Ivy Lee Method to organize my work days, it's working very good for me :)

If it's deep, I'll keep everything aside for a day, change my laptop wallpaper to give it a fresh look, and clean my workspace so to give myself the feeling of a fresh restart!

I used to deny myself wifi at home because I always wanted to be "out" while working on my laptop. I would find that taking the drive to a coffeeshop would make me want to make the most out of the trip. It's so easy at home to start thinking about chores or working out or other life goals besides the boring work that is in front of you. TL;DR: Strand yourself on an island (a cafe will do in a pinch) with no other options

Most days, my focus feels like that for a goldfish on a roller coaster! 😂 Jokes apart, I try to follow the Pomodoro technique to maintain short bursts of focus. With small breaks every 25 mins or so, it becomes much easier to maintain focus.