The most important factors in increasing your page rank are as follows:

 

-The frequency with which a certain keyword is present on a page. However, you should bare in mind, that spamming a keyword, for the sake of increasing your page rank is considered a Black Hat SEO technique and you may be penalized for it

-The location of a keyword on your webpage – the higher the keyword is on a page, the more relevant it I considered to be i.e. the a keyword present in a page’s title is considered more important than one at the bottom of that page

-The number of times a search result related to your website is clicked by visitors increases the relevance of your website and thus, the page is elevated higher in the search engine’s results

-The number of links to your website present on other websites, the number of links to outside websites present on your website and the number of internal links on your website, relevant to its content also increase its page rank.