are there any threads where i can just advertise my shop with a link?

there's not really any point in advertising your shop as a whole. people buy whatever shows up cheapest in the shop search, so as long as you match those prices, your regular-priced items will all sell eventually. what people will do for higher-priced items that tend to sit around unsold for a long time is make a post in the advertising forum offering some sort of sale, usually 20-30% off, on items above a certain price in their shop. then people can post there telling you what they want and you can set up a trade for the sale price.