these are many ways to improve ranking of your site through multiple SEO tactics like:-
- "Content" which is most important in improving SERP. It should be unique and fresh.
- "Link building works" like blog commenting, directory listing, guest posting, bookmarking, classifieds.
- "Social Media"facebook, twitter, google+. Posting websites updates, blogs, rss feeds, videos,etc.
- "Updates of website" is also one of the most important factor that assist in keeping you at the top of the lists or improving search engine result page.