Your situation sounds very similar to a story i posted in that magical success stories thread of mine. Basically, the guy had an old car that he had listed for 6 months which simply would not sell. He did a sigil working with a planetary square as @Dinmiatus and @Lady_Eva are suggesting here. 2 weeks later he got a buyer that was insanely obsessed with buying the car. I imagine you could do the very same thing. One sigil working with the intent to sell all the items you put up online
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