I think you should add more bosses, like create your own and make them drop custom drops. Creating these types of bosses would atract new players to see what these new items do and also see what the new bosses are about.
Another idea is maybe you can create a shop tab that lets you quick buy certain bundles. For example, 1 Defence pure can be a category in that tab, it could consist of items from iron to full ghostly with unholy book and such and such, or another category could be quick buy all runes or just certain runes like barrage runes or vengence runes.
Take into consideration ^