Any suggestions?
Just thinking out loud, your time could also be spend editorially adding more and more subjects and quality lists. The whole problem with such a site is that you need to maintain some level of quality, which is best maintained by attracting people that care about that quality. If you have a lot of quality lists with quality subjects, the next thing you need to ensure is that Google (and other search engines) pick up on that.
If I search for "emacs color themes", for example, you want listry to be the #1 match in Google with a list of links to color themes.
That, and just balls: try to get some popular bloggers to cover your site. If they like the concept, they won't mind vouching for you.
Congrats, cool site :