Selling KATSEYE PC’s

Hey! So recently I started selling all my KATSEYE PC’s, nothing against them or anything, I still very much love them! But recently decided that I wouldn’t be able to collect all their pc’s hence why I’m selling! I’ve been selling most on Mercari and Vinted which has been pretty good so far. If anyone knows how to sell them quicker that would be awesome! I’ve been wanting to sell them on Instagram but not sure how if anyone knows or has any tips that would be great. I also want to get into trading since pcs are getting pretty expensive, I’m looking for aespa pcs only! While I’m at it if anyone wants to be moots I’d be down! My ult group is aespa. I’m very welcomed to any other groups I don’t judge, honestly just looking for friends to talk about k-pop and stuff. Recommendations are always welcomed!