Currently in the VRChat UI, if you go to someone's listing on the marketplace, the "More From This Creator" section will only feature the latest 8 avatars on the marketplace from that creator and no dropdown to view older listings. This can become problematic as more avatar listings are created by a seller, older ones can get drowned out and receive less visibility, I believe having a dropdown appear would be beneficial to both buyers and sellers. World creators already have a dropdown menu in the "More From This Creator" section where you can view every world uploaded by a user.

Also, if you select an avatar that from "More From This Creator", the listing doesn't get replaced by another listing, it just disappears from the section.