most of us have hit a slump...my way of dealiing with it is to redo some stuff in my shop, tweak photos, tags and titles, do a little promoting in new places and add new items...i think the attention and activity in your shop is good for both you and your shop and it keeps your shop up in rankings even if you are not making sales...
there's always a lot to analyze--what was selling best? when? to whom? why? for special occasions or events? think of new ways to market...
have fun and good luck