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Background STORY: I'm a wordpress theme designer,  and i have a 3 years old  wordpress-based site in english language with more than 100 post. Let's just called this site "olddomain.com" (generic brand name, didn't have keyword on it) Almost all of content are just showcase post and download link for my Free Wordpress Theme Download. So the site is lacking in terms of quality article content. I never doing any SEO work (keyword targeting,etc)  for this  "olddomain.com ", but the site backlinks is growing viral since the beginning, perhaps due to the nature of a "freebie" site. Using the OSE, it showed 12,850 Total Links from 349 Linking Root domain. Back when Y! Site Explorer still exist the number of linked domain is around 64,000+ links, and google webmaster tools show the number of 655,000+ Links.   It's now has PageRank 5 (for almost a year) , with Home Page Authority 62/100 and Domain Authority 55/100. But in terms of traffic and revenue, the site is doing pretty bad. I only got less than 3000 visit per month. Revenue less than $10/month from adsense, and generated less than $1000 over the last 2 years from premium wordpress theme affiliate program. Some people told me that i have to  add more  article to attract traffic. but the thing is, i don't really good on writing english article, It's not my native language, so i can't really express my thought. I  know i can outsource article writing, but i feel more comfortable and affordable if i write from my own mind. RECENT STORY: For the last 3 months i  also learn more about SEO and internet marketing , and  recently doing some local keyword research in my native language (Indonesian) with google keyword tools combine with SEOmoz keywords analysis. I found more than 100+ of Indonesian keywords in multi-niche with more than 3000+ Exact local search/month. And after using SEOmoz keyword analysis, almost all of them are in relatively low competition level under 40% . So The Potential is HUGE. MY IDEA: I want to create a new multi-niche informational content-rich website based on the keywords i found on my language. Something like about.com, squidoo, or hubpages. My question is : 1. Should i completely start that  site in a "newdomain.com"  completely from scratch (No Pagerank, Backlinks, PA, DA) ? or I just use my existing "olddomain.com" which already got the link advantage (Pagerank 5 with thousands of backlinks) and just  recreate the site-structure and put the new article content on it, although it's on different niche and different language . 2. What's the effect for search engine if you changing your site content to different niche (from wordpress theme to Multi-niche Informational website) and also to a different language (english to indonesian) Best Regards,
Faizal