Read on articles and reflect on others' work because that can help you gather more ideas. Another benefit of this would be learning to differentiate between good and bad writing. Don't stress yourself out when doing this, though.
I agree with the "stop what you're doing" approach, because it allows you to take a breather for a bit. If you force yourself, you will just get into a bigger writer's block. At least, in my experience it's the case. Try to relax