Change your scenery completely. change the lighting, the sounds, the atmosphere, the style of decor you are in, change the age group you are around, or hearing or seeing..
Go out and while you are out, put a very small piece of paper in your pocket with a pen, no big notebooks or computer. If you can brave it, take no paper. Go enjoy another chapter in your brain.
Wonder what you've never been introduced to..wonder where things are that you don't know about and wonder who does know about them..Notice small details and happenings around you, and peoples' funny little quirks. Wonder how people perceive you,..do you disappear, or are you noticeable. Wonder how many people are totally off track of what they'd really rather be doing? Where would they be if they weren't here? What are they having for dinner tonight. Who has a beloved dog, and who's been bitten by one? Life is full of exhaustive avenues and facets.
The *lack of a place on which to write a lot down, and the mental break you give yourself, will free your self-pressure and subconscious resistance you were feeling, and even give you separation anxiety from your computer, but play that struggle until you finally relax.
Without a lot of paper, after awhile you will get an idea and want to write but your paper will be too far away.
That will make you want to get back with it before you lose an idea that just flooded your head.
(I get anxiety when I have no pen and paper on me,..money and chocolate I can live without..).
So, ok, write *key words only, on your tiny paper, and stay where you're at until it's full, or wander further.
Ideas come to me right when I realize I've forgotten or get separated from my writing supplies,..funny.
It's like when you can't remember if you've forgotten anything before you leave the house on an errand, and then once you are on the road, that's when your brain clears up and you clearly remember what you needed that you now don't have, so you have to go back and get it. Leaving cleared up your head!
Something else to try..
Writing down the exact opposite things of your subject matter, and weirdly, it can inspire new ideas from an *adversity point of view.
Opposition can be enlightening and mysterious, as can the *unexpected.
Comedy, for instance, uses the *unexpected in order to get a rise out of their listener. It also uses 'interfering' factors. So do other story categories.
Make a list of those 'interrupting circumstances' and it may bring on a sliver of light to a flood light of new scenarios.