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How do I improve the PR6 to next rank? Does anybody have any idea?
As backlinks grow, Google is always re-scoring the PageRank they use in their calculations. But they do not change the PR that is reported on the toolbar to match. Instead they only update the Toolbar PR about four times a year.
So your site may already have gone up another notch, but you can't see that on the toolbar yet. But because of the steep logarithmic scale, it is more likely that a site would grow from "low PR 6" to "middle PR 6", and the toolbar will not report that kind of fine tuned scoring - only Google knows.
More information about PageRank is available in the Hot Topics area [webmasterworld.com], which is always pinned to the top of this forum's index page.
PR7 for most folks seems hard to sustain & unless you are really unique and popular PR8's + have a good chance of an editor review if they don't match the quality of the traffic.
But keep building , it can only help , but don't be dependent on it.