Do something brainless.

Like taking a shit.
Showering.
Hear music loud and dance.
Talk to people but don't listen.
Surf in the internet.
Masturbation.
Sport.
Take a walk.
Watch TV.
Cook.
And so on and so on.

Most of them are doable for hobby projects at home. Some are also suitable for work. Choose appropriately.

But if I am stuck, then continueing to try solve the problem most often keeps me stuck. So doing something else is my solution. So far it worked well.