renaudgagne,
I know your question wasn't directed towards me, but I got my alexa score down to about 70k, but now its back at about 120k.
The major steps I took to reduce my rank (and then stopped doing which put it back up) were:
1) Join discussions with other PF bloggers in the comments sections on their sites. Don't just fire off random comments, but start meaningful discussions which will be beneficial to everyone.
2) Interact with PF blog owners via email and social media. Again, introduce yourself properly and start a mutually beneficial agreement with each site.
3) Get more involved with Yakezie.
On the final point, I have slacked in the past couple of months. However, I've just moved from being employed full time to focusing on my other projects (including moneystepper), so you'll have to put up with more of me on the forums now!!
Next stop for me – back to 100k!!