I have published under about a half-dozen names for about 25 years. I never have experienced writer's block. More commonly, I don't have time to write everything I want to.
When I have taught creative writing, a version of one of the techniques that I used was suggested here. I would ask students to write for three or four minutes without stopping. If they couldn't think of anything to say, they wrote, "I can't think of anything to say." At the end of the time, I asked them to look over what they wrote to see whether a thought was forming, then repeated the process two or three times. Almost invariably, they had discovered what they wanted to write by the third or fourth time.
I also look through the thousands of images I have shot around the world. That led to my Delhi traffic piece last week. And I keep a list of ideas that I want to explore as they occur to me.