Hi, I was continuously acquiring quality back-links and my site was moving up in Google SERPS for 3 main keywords. Within a few weeks  i was on Page 2 and 3  for these three keywords, but after reaching there I got stuck on these pages and positions despite no change in link building strategy / pattern. I have even increased the number and quality of links that I acquire per day, but I am still stuck at exact same positions. The website is10 months old and related to a software niche. I update this website once a week. For one keyword I am stuck at position 1 of page two (you can well imagine the frustration..!!). My question is that what do I need to do to get out of this "SERP lock"?