I'm pretty sure that at some point, everyone who writes used to write for fun. But then, pressure was added: papers, essays, novels, newspaper articles, and the list goes on. You can't take away the pressure, but perhaps you can bring back some of the fun. Here are ways to bring some more fun and creative energy back into your writing to tackle writer's block.
1. A blank page is a canvas, not a black hole.
When you see a blank page, it can be hard not to wonder how on earth you are going to fill it up with coherent and engaging writing. Thinking like this isn't great for creativity and it really sucks you into a dark hole of depressing procrastination. When I catch myself thinking like this, I remind myself that this is my canvas and my words are like paint. I am essentially a creature in charge of a work of my choosing. When I think like this, it gets a lot easier to spitball thoughts around and get a little crazy with ideas.
2. Just write! Don't stop and don't judge.
When I literally have nothing going on in my head, I just write. I write about anything and everything and I force myself not to judge what I'm writing. Most of what I write is pretty bad but sometimes there are times when my writing just flows and I actually write something pretty good. Other times, most of it is bad but there's one little section that I can use. It's just a matter of polishing it a bit and expanding it a bit more.
3. Change your canvas.
Most of the time, I type my writing but when I really can't think of anything, I change to pen and paper and, surprisingly this can be helpful. I'm thinking this might be due to the change in mechanics (forming letters vs. tapping out words) but it also might be a means of writing mindfully, of slowing down instead of light speed typing all the time.
4. Write at night or early in the morning.
My last suggestion is to write at some late or early hour. I do this when I can't sleep and I find that I'm actually pretty creative. And apparently science backs me up on this one. Also, it's really quiet and peaceful at this time (since normal human beings are asleep already) so you have plenty of time and space to think. A bit of silence can do some good.
I hope this was helpful and, most importantly, I hope it adds the fun and creative fervor back into your writing.