Do stuff. "National Geographic" if you can't get out of the house, but if you can, at least go for walks. Look around and see what the world looks like. Listen to what people in coffee shops talk about. Have experiences.
Also, depending wholly on your style: Write fast, write hard, then go in and cut.
Last Sunday, I wrote 5,000 words in about three hours. Today, I cut 1,000 words from those 5,000, and I think that's down to a sellable level (It's a short story).
If I'd tried to just write the right 4,000 first, it'd have taken longer -- the 5,000 is all the good stuff, plus some extra "Well" and "So" and "in order to" phrases that I could cut to make the story sharper, as well as a few joke-segues that didn't cut it.
King says that the right story is the almost-right story minus ten percent. In my case, it's often closer to twenty.
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