I do see a way out of this conundrum, but it may not prove to be any more than my way out.
If it turns out to be valuable to others, that will be fine. It has already been valuable to me, so "to others" may be possible.
My way out is to look at the object itself, not to its content or its seriousness. What is the thing itself? That is, to substitute "is" for "about."
Very few of us have any training in doing this. I've had a little, but I struggle, too. I even make things that explicitly do not have any content,* that are simply themselves, but I struggle.
My personal "bible" is Richard Lanham's
Analyzing Prose, but if you don't have jstor, it's hard to find and expensive if you do. Shorter and more accessible (
https://sites.ualberta.ca/~dmiall/LiteraryReading/Readings/Sontag%20Against%20Interpretation.pdf) is Susan Sontag's essay "Against Interpretation," which argues for looking at the thing rather than using the thing to look at (or even to create) something else.
*In spite of my best efforts, people who have read my stuff are able to find all sorts of content and seriousness, even profundity in it. Which puts us right back into that hard sell (I've never been able to sell it, anyway) that all the important stuff, all the stuff we keep insisting is important, can be more successfully located not in the work or in the reader/listener but in the relationship formed when someone engages with a work.