It is usual to rank the minor keywords and you need to prioritize the using of your main keywords as to position in the search engine. Your site is not banned and if you want to check it, you use this link. http://www.selfseo.com/google_ban_tool.php
no it is not banned i can see u r site in google . fall u r page rank ... don,t worry about u r site.....!!!!
you can check your competitors related to your keyword in google search . type "allintitle:your keyword" example if i want to know my main keyword competitors means how many websites on internet which contain " free seo tips" in their title then i will type in google search box "allintitle:free seo tips" this term will show you exact result. Got the idea ?