I want to Migrate To WordPress

Hi Friends, I’m using wordpress from last 2 years and now I’ve bought a site http://www.rockpaki.com which is on blogger, I want to ask that If I migrate to wordpress then Would I lost all of my traffic? or as you can see the DESIGN of this blog.. Its paid. I dont want to lost it, May I migrate everything to wordpress or not, Seriously, Its a tough decision for me to migrate or not.
Thanks for your positive replies.