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I have a lot with all four sheets of the world at war us set with some other stuff but no bites.
That is a five (5) sheet set, 1941, 1942, 1943, 1944 and 1945, thus your offer is not "complete" for the series.
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But other lots like a dozen mint sets with the pretty mint set books are not selling
Those can be a hard sell as it will only go to someone who wants the book and those folks are uncommon. For a collector, all the book does is add a large shipping and handling cost to a bunch of stamps. You should, if you have not already done so, see what similar items have sold for and how frequently they do sell compared to those available for sale.
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lots of plate blocks, sheets, souvenir sheets
Individual items or related small groups seem to do well while larger groups start to look like a discount postage lot. Again, you should check the prices (Total for item and S&H being aware that some state also collect sale tax)) of similar sold items and price competitively to that. To get full face without additional costs nor fees, you can always use the stamps for postage on the items which sell.
Lastly, your title matters as those words are what generates views in a search (see my last paragraph below as well). An example is Scott number, denomination and class (priority, express, priority-express) to help get views from how folks search. Then a word or two to cover the subject matter of the stamp. Got 800 damaged used US? Then mention "art projects." If you take some time to search for the same item using different search terms and key words, you start to see what shows up. Then there is no crime to copy the words those sellers use. Lastly when you search other's listing of similar material, see into which categories they place the item.
I have many searches set up, some narrow and some broad. My broadest is searching everything with the one word, "parcel" to find parcel post related goodies.Yes, I must wade through a river of unrelated listings (gem parcels for example) but I do find stuff my targeted searches miss, material worth the extra search results sifting. I find items which for whatever reason were listed poorly or with an error.
How you list shipping and handling can have a big effect. Too expensive turns folks away. Likewise, "free" shipping can be a turn off as well. We buyers know shipping costs are embedded in the price of the item being sold. If I buy only one, yes I know I paid a fair shipping price, but when I buy ten I am getting screwed since I am paying S&H on each item but the seller's cost to ship is maybe 2 times a single item and definitely not 10 times a single item's shipping costs to the seller.
Lastly remember that while you can put everything and I mean everything into the description, that does nothing for you material when folks do not search
title AND description.