Need suggestion!!

My micro niche is was on number 1 and number 2 position for its keyword a week ago. It have 500+ HIGH PR **************** links and have been holding TOP2 position from last 2 months!

My domain is like this " keyword.net"

Today when I was checking ranking of my sites, I was surprised to see a "keyword.com " site on TOP position.

That site only have 2 backlinks with no content!!!

What should I do now? I still build links for my site. 5-6 links each week.

How to outrank that .com domain ?

well wait for a minute. Higher PR of that .com ?

Also might be a google dance. Google tries to see who fits in that place the most.

If the .com is new with all in the title it could be due to the google dance which pushes new sites with content into a high position and then it can settle lower.
If the .com was available why did you buy the .net? ( I know it could already have been taken obviously).
Also 5-6 backlinks a week is too low, even for a newish site you should be able to make 50-60 with no problems (remember quality is better than quantity) after that add more unique content and send backlinks to the content. This should have you back at the top as the other site drops.
HTH