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On Wednesday I noticed our domain was no longer ranking for our key word and our product Isolator Fitness, http://isolatorfitness.com, I have been researching and not finding answers to why it happened and  what to do to fix it. We have about 800 other pages still listed. I am new to all this seo stuff, can anyone guide me in the right direction.
History about 10 days a go I went google web master tools and noticed that there were a large number of errors due to the fact the robots could not crawl our site. Looked at the site and found that Privacy button on WP was turned to block robots. I turned it on and had google re crawl the site, looked like google was not able to crawl the site for about 3 months, on Monday I did a 301 redirect to on of our other sites for another product we sell, to http://isolatorfitness.com/6-pack-bags. This site had a good bit of back links would doing all this at one time cause this How do I determine if we did anything wrong Thanks

I am trying to rank for let's say the keyword "their site" , my competitor has theirsite.com, with next to no seo but are ranking #1 , my site lets say is mysite.com/their-site my site is about the same age and has a PR of 4,their site has a PR of 0 and 2 backlinks, how difficult will it be to get to number 1, am at spot # 5 in google now. Thanks David