I had similar rouble when writing what I considered to be the thesis statement of the shared universe of my creative works, selfishly named the Lunaverse. In specific, I wanted to write my "Hello, I'm new, I'm going to write for NaNoWriMo, I want to write Fantasy and/or SciFi, and just to be very very clear, the historical baggage belonging to the GSRM community Does Not Fucking Exist Here."
I was worried that I would be against the rules if I didn't create a story, so I made Musings Across Timespace, a oneshot featuring a transgirl named Q-Tau who got Isekaid from Earth TO this fictional universe, and is basically the only living person in scifi futuretech spaceship heaven who used said futuretech to give herself the only zero-drawback transition I will ever give a character, and pore over some logs collected by the research vessel describing the world in which Solstice, my current work-in-progress, takes place. Like, literally that oneshot is an excuse plot for me to set the level with my readers, because where else was I going to put it? A comment on my profile?
You could make like a fictional "encyclopedia", or make a story where an elderly historian realizes they're about to kick the bucket and so passes down the lore of your world to their apprentice in the hopes that the collected knowledge will be preserved, long into the future. Actually that'd be really cool and I might read that.
You could also do like a oneshot of a family going to like a movie theater featuring some sort of documentary, maybe serious, maybe more MST3K style, where the story-in-the-story has your world details and you have your characters reacting to it for funsies.
You could make a School Life where you have a soon-to-be-dropout having procrastinated their essay for fuck knows how long and they need to pull an all nighter STAT so they look up as much information on the subject of their essay (your world) as they can.
In short, if you're worried that your work needs a story to see approval, slap an excuse plot on it which serves as an excuse for your loredump to exist. All it has to do is technically be a story with characters doing things, and you're good.
