PR4 rank gone

I don't know what happened to my pr4 ranking last month but I'm asking questions just like alot of other folks here online that had their pr ranking ripped away from them by Google. i have no idea what i did or didn't do but i wasn't too happy to say the least when my wife told me that my ranking was now a pr2. did i do too many paid blogs? did i not do enough non-paid blogs? or maybe i didn't visit enough of other blogs. many questions run through my mind at night time when i sleep. I'm sure there are many others like me having more questions then answers to this dilemma. so what I'm doing now is visiting other peoples blogs as often as i can and trying to gain some more links. no, i don't have a magic wand or secret that will give me a pr4. i don't even know how i made a pr4 blog or what i did to get it. but one thing is for sure. i want it back and I'm doing everything i can right now to get it back. i didn't realize just how fortunate i was to have it until it was gone. if anyone out there has some ideas how i can get it back please don't hesitate to share with me although if that was the case, they would be working on their own blog, not mine.