How to Increase Pagerank of my website?

PageRank is based, as it always has been, on the number and quality of incoming links.

Google removed PR information from Webmaster Tools five years ago, because they decided it was no longer important and not something they wanted site owners to be concerned about.

https://productforums.google.com/forum/?hl=en#!category-topic/webmasters/webmaster-tools/29GtmYDt8L0

See also http://googlewebmastercentral.blogspot.co.uk/2011/06/beyond-pagerank-graduating-to.html