Dealing with writer’s block is a tricky business. Maybe instead of coming up with a topic on your own, you could do this: Use a random topic generator to jumpstart your creative process. The Internet is full of the random topic generators, but here are some especially for writers.
If you don’t like the topic you see, that is just fine. Click the button again to see if you find something else that gives you a nudge in the right direction. Once the ball is rolling, who knows where it will take you?
The Time Is Now offers weekly writing prompts, so perhaps you could try checking those out, as well. r/Writing Prompts might also be up your alley for producing some words and filling up on that dreaded blank screen.
On the other hand, what if a verbal prompt doesn’t help? Maybe ekphrasis is a strategy you could try. Ekphrasis involves responding to something visual and vivid, like a painting or a photograph, in writing. All you need is an image or a set of images to get started, and we just happen to have one right here.