Then, I suggest you start with posting new and unique content daily. Try not to submit your article using a lot of keywords. Optimizing one keyword per URL is sufficient. Repetition at 2-3%. Keyword should be used in title.
You can use unlimited keywords for your website. It all depends on you that on how many keywords you want to promote your website.
Hi , According to search engine point of view you should add 5%-7% o your page including meta tags and content. If it is more than that then it may create problem for your site.