If it’s a personal project, I’ll put it off for a while and do something else to switch things up - I might work on a different project for a day and then pick the first one up again.

If it’s a work project, I can’t naturally put it down, but I might just drop it for a shorter period of time, like a minute or two. Get up, take a walk, refresh my thoughts.

This may of course be a slippery slope for some, but for me it’s proven effective in juggling my projects.