Hi Sarah,
Assuming that it is indeed the prices that resulted in a drop in sales, it may indicate that you are reaching out to a different customer base than before, and that the customer group that was buying from your previously is no longer your target market. It takes time to build a new "audience," so to say, so patience, patience, patience... If you cannot afford to wait and were making enough profit before, then you know what to do...
However, that assumption is still an assumption -- when you see a correlation, it does not mean causation. And while in your own shop you notice what you do and what changes you make, the market is so big and the variables that affect the broader commerce are so many that it is truly had to make a conclusion like this right away. To really know if the prices drive your sales, you would have to do this experiment a few times (which in real life and for a small business may not be possible).
Here are some questions to think about, as you are trying to figure this out:
-- How stable is your customer base? Do you have many returning customers? If so, it helps in figuring this out.
-- Was the change in pricing the only thing you changed in your shop?
-- Did the sales drop on the lower price range?
-- If so, do you need to offer an additional variety of items (at the lower price range) so that you could expand your price range and still keep teh old customers, whil trying to appeal to the new market?
Hope this helps :)