By taking pictures.
Yes you heard right. My new participation in a classic 365 photography project has started the creative juices going. I'm not particularly sure why, but continually trying to restart blogging for a little over 4 years has been a chore, and therein lies the solution.
What to do when stuck
Do something different, something new, and something you enjoy. Do something that's not a chore, and make that your blog.
Photography is new to me, but where I had lost my will to blog, I hadn't lost the creativity that I would have invested in blogging. It was still there looking for another outlet. With the photography, I'm given a chance to be unique and creative in bite-sized, manageable and relatively brief chunks, every day.
Don't be afraid to leave it
As strange as it sounds, trying to force blogging to come means finishing the night, week, or month with nothing. It's better to let the writing come as you feel like it than end up with something forced out, or nothing at all for months on end. Relax, enjoy your favorite beverage, and write the posts if and when you feel inspired. You just can't put creativity on a conveyor belt.