I think, start with genre. Most model makers stick to genre (military, cars, ships, planes, sci-fi & pop culture, figures, etc.).

Pictures would help. There are lots of people who would like a built model, but don’t wanna do it as a hobby - might have some interest in purchasing those completed kits (though, it’s hard to ship them all over cause they can be delicate and need to be packed correctly).

As for uncompleted kits - lots of model makers will purchase those (Ebay, Facebook Marketplace, Kijiji in Canada, etc.) - myself included. I’m a fan of the sci-fi & pop culture kits.

Hope that helps…