Writers, especially amateurs, often complain of writer's block. In general terms, writer's block happens when the writer gets stuck writing the content. Most often, writer's block gets attributed to the creation of fiction; however, it can--and does--occur when writing nonfiction.
I seldom suffer writer's block. That doesn't indicate an endless creativity of my mind or anything else so superhuman. It merely means I've learned how to deal with it. No one single method that works every time for every person. Therefore, the smart writer develops multiple methods for handling momentary crises of creative failure. Following are some of mine:
If you happen to be a gregarious sort--unusual for writers--then you might want to beg friends and family members who can be trusted to be candid, but not cruel, to read what you've written and offer their suggestions as to plot developments. I never do this, but that doesn't mean it won't work for you.
Writer's block isn't the kiss of death for your creativity or your career/avocation. It merits a pause, indicates that you may need a break, or that there's another story concept bubbling away that needs to come out now before it implodes and you've lost the idea.
Knowing if a story concept is worthy of time and attention ain't easy. Not all ideas grow organically. One book I wrote, Pure Iron, because I'd read one too many crappy "new adult" novels and said, "I can do better than that." Then I set out to prove it. Sometimes ideas come at inopportune times and dissolve like smoke in the wind. Other times, I'll get an idea which will intrigue me for days; however, when I try to develop the story in my mind, it doesn't go anywhere. And finally, I've had a few ideas that I mentally developed, spinning out the story in my mind for months or even years, but cannot write to good effect. Those are best left inside the brain.
The best way to tell a story comes from advice written in Beauty by Robin McKinley: "Begin in the middle and work outwards. Don't be stuffy." Not every story must begin with "once upon a time."