I think one of the most important things you can do is optimize your announcement, shop sections, item descriptions, tags for search engines! SEO is the most effective tool available for getting your product seen.
Another technique used by the busiest sellers is relisting. I personally have not started doing it yet, but I know I will be once I get my inventory where I want. Right now only a small fraction of what I have to sell is listed. There are lots of great articles out there and some are here in our thread 'Success on Etsy' and also on our page on the blog called "Our 'Tool' Box".