If you are already on PR2, be carefull in your link building methods and make sure also that your content must update well. Check your content that you add up is not duplicated. And your link building must be observe well. Be aware on the number of links you build. If you are just maintaining your site, minimal link building is good. Don't bombard it with lots of links. It won't help.
Thanks for writing, I very much liked your newest post. I think you should post more frequently, you evidently have natural ability for blogging!
These days pagerank does not hold much value, so if you are not loosing traffic from the down of your pagerank, there is nothing to worry about.